fix MXNET_EXTERN_C undefined
fix MXNET_EXTERN_C undefined

larroy/mxnet,stefanhenneking/mxnet,lxn2/mxnet,LinkHS/incubator-mxnet,sxjscience/mxnet,reminisce/mxnet,stefanhenneking/mxnet,precedenceguo/mxnet,ptrendx/mxnet,antoan2/incubator-mxnet,Northrend/mxnet,rahul003/mxnet,likelyzhao/mxnet,hotpxl/mxnet,DR08/mxnet,yajiedesign/mxnet,danithaca/mxnet,arank/mxnet,arank/mxnet,szha/mxnet,reminisce/mxnet,tlby/mxnet,kkk669/mxnet,ptrendx/mxnet,TuSimple/mxnet,crazy-cat/incubator-mxnet,thirdwing/mxnet,tlby/mxnet,LinkHS/incubator-mxnet,mbaijal/incubator-mxnet,leezu/mxnet,fullfanta/mxnet,leezu/mxnet,jermainewang/mxnet,antoan2/incubator-mxnet,arikpoz/mxnet,rahul003/mxnet,xcgoner/dist-mxnet,jiajiechen/mxnet,sergeykolychev/mxnet,arikpoz/mxnet,jennyzhang0215/incubator-mxnet,hpi-xnor/BMXNet,reminisce/mxnet,CodingCat/mxnet,wangyum/mxnet,DickJC123/mxnet,tlby/mxnet,Guneet-Dhillon/mxnet,Mega-DatA-Lab/mxnet,vikingMei/mxnet,Ldpe2G/mxnet,hesseltuinhof/mxnet,thirdwing/mxnet,rahul003/mxnet,szha/mxnet,DickJC123/mxnet,Mega-DatA-Lab/mxnet,ShownX/incubator-mxnet,LinkHS/incubator-mxnet,EvanzzzZ/mxnet,luoyetx/mxnet,Ldpe2G/mxnet,wangyum/mxnet,ykim362/mxnet,antoan2/incubator-mxnet,jermainewang/mxnet,pluskid/mxnet,luoyetx/mxnet,ShownX/incubator-mxnet,pluskid/mxnet,larroy/mxnet,madjam/mxnet,likelyzhao/mxnet,vikingMei/mxnet,smolix/incubator-mxnet,apaleyes/mxnet,Northrend/mxnet,ForkedReposBak/mxnet,hpi-xnor/BMXNet,lxn2/mxnet,hotpxl/mxnet,crazy-cat/incubator-mxnet,jermainewang/mxnet,indhub/mxnet,stefanhenneking/mxnet,formath/mxnet,precedenceguo/mxnet,smolix/incubator-mxnet,tornadomeet/mxnet,crazy-cat/incubator-mxnet,arank/mxnet,szha/mxnet,fullfanta/mxnet,ShownX/incubator-mxnet,TuSimple/mxnet,antoan2/incubator-mxnet,DR08/mxnet,larroy/mxnet,ZihengJiang/mxnet,hpi-xnor/BMXNet,crazy-cat/incubator-mxnet,Guneet-Dhillon/mxnet,ForkedReposBak/mxnet,danithaca/mxnet,apache/incubator-mxnet,sxjscience/mxnet,weleen/mxnet,ForkedReposBak/mxnet,apaleyes/mxnet,danithaca/mxnet,pluskid/mxnet,ykim362/mxnet,sxjscience/mxnet,apaleyes/mxnet,crazy-cat/incubator-mxnet,apache/incubator-mxnet,thirdwing/mxnet,weleen/mxnet,jennyzhang0215/incubator-mxnet,hotpxl/mxnet,pluskid/mxnet,wangyum/mxnet,szha/mxnet,hesseltuinhof/mxnet,Northrend/mxnet,jennyzhang0215/incubator-mxnet,DR08/mxnet,DickJC123/mxnet,CodingCat/mxnet,precedenceguo/mxnet,DR08/mxnet,fullfanta/mxnet,gautamkmr/incubator-mxnet,coder-james/mxnet,larroy/mxnet,jiajiechen/mxnet,navrasio/mxnet,jermainewang/mxnet,rishita/mxnet,xcgoner/dist-mxnet,DR08/mxnet,likelyzhao/mxnet,formath/mxnet,jermainewang/mxnet,ptrendx/mxnet,ykim362/mxnet,yuruofeifei/mxnet,rishita/mxnet,Mega-DatA-Lab/mxnet,fullfanta/mxnet,reminisce/mxnet,gautamkmr/incubator-mxnet,Guneet-Dhillon/mxnet,piiswrong/mxnet,ShownX/incubator-mxnet,zhreshold/mxnet,jamesliu/mxnet,LinkHS/incubator-mxnet,ShownX/incubator-mxnet,weleen/mxnet,madjam/mxnet,yajiedesign/mxnet,lxn2/mxnet,weleen/mxnet,jamesliu/mxnet,precedenceguo/mxnet,navrasio/mxnet,CodingCat/mxnet,thirdwing/mxnet,arikpoz/mxnet,EvanzzzZ/mxnet,weleen/mxnet,Prasad9/incubator-mxnet,madjam/mxnet,xcgoner/dist-mxnet,stefanhenneking/mxnet,antoan2/incubator-mxnet,DR08/mxnet,tlby/mxnet,yajiedesign/mxnet,ptrendx/mxnet,yajiedesign/mxnet,ZihengJiang/mxnet,danithaca/mxnet,Northrend/mxnet,hpi-xnor/BMXNet,ForkedReposBak/mxnet,hotpxl/mxnet,gautamkmr/incubator-mxnet,tlby/mxnet,jennyzhang0215/incubator-mxnet,arank/mxnet,coder-james/mxnet,nicklhy/mxnet,sergeykolychev/mxnet,nicklhy/mxnet,Ldpe2G/mxnet,nicklhy/mxnet,solin319/incubator-mxnet,CodingCat/mxnet,xcgoner/dist-mxnet,jamesliu/mxnet,rahul003/mxnet,ForkedReposBak/mxnet,smolix/incubator-mxnet,leezu/mxnet,jamesliu/mxnet,apaleyes/mxnet,hpi-xnor/BMXNet,Guneet-Dhillon/mxnet,piiswrong/mxnet,pluskid/mxnet,TuSimple/mxnet,saurabh3949/mxnet,eric-haibin-lin/mxnet,wangyum/mxnet,ykim362/mxnet,TuSimple/mxnet,hpi-xnor/BMXNet,wangyum/mxnet,leezu/mxnet,kevinthesun/mxnet,Ldpe2G/mxnet,ZihengJiang/mxnet,ptrendx/mxnet,lxn2/mxnet,dmlc/mxnet,indhub/mxnet,jamesliu/mxnet,TuSimple/mxnet,zhreshold/mxnet,EvanzzzZ/mxnet,jennyzhang0215/incubator-mxnet,tlby/mxnet,rishita/mxnet,hotpxl/mxnet,rishita/mxnet,hesseltuinhof/mxnet,leezu/mxnet,precedenceguo/mxnet,Northrend/mxnet,dmlc/mxnet,tornadomeet/mxnet,yuruofeifei/mxnet,mbaijal/incubator-mxnet,larroy/mxnet,fullfanta/mxnet,reminisce/mxnet,kkk669/mxnet,piiswrong/mxnet,ptrendx/mxnet,sergeykolychev/mxnet,antoan2/incubator-mxnet,fullfanta/mxnet,coder-james/mxnet,tornadomeet/mxnet,vikingMei/mxnet,Guneet-Dhillon/mxnet,ZihengJiang/mxnet,luoyetx/mxnet,lxn2/mxnet,tornadomeet/mxnet,larroy/mxnet,nicklhy/mxnet,kkk669/mxnet,smolix/incubator-mxnet,eric-haibin-lin/mxnet,sergeykolychev/mxnet,szha/mxnet,jiajiechen/mxnet,antoan2/incubator-mxnet,yajiedesign/mxnet,LinkHS/incubator-mxnet,EvanzzzZ/mxnet,likelyzhao/mxnet,Guneet-Dhillon/mxnet,xcgoner/dist-mxnet,coder-james/mxnet,kkk669/mxnet,weleen/mxnet,tlby/mxnet,TuSimple/mxnet,jamesliu/mxnet,Ldpe2G/mxnet,ShownX/incubator-mxnet,DR08/mxnet,indhub/mxnet,kkk669/mxnet,crazy-cat/incubator-mxnet,smolix/incubator-mxnet,mbaijal/incubator-mxnet,pluskid/mxnet,reminisce/mxnet,solin319/incubator-mxnet,jiajiechen/mxnet,jiajiechen/mxnet,wangyum/mxnet,coder-james/mxnet,sxjscience/mxnet,navrasio/mxnet,eric-haibin-lin/mxnet,apaleyes/mxnet,rahul003/mxnet,piiswrong/mxnet,arank/mxnet,saurabh3949/mxnet,mbaijal/incubator-mxnet,EvanzzzZ/mxnet,DR08/mxnet,tornadomeet/mxnet,hesseltuinhof/mxnet,vikingMei/mxnet,solin319/incubator-mxnet,indhub/mxnet,hesseltuinhof/mxnet,formath/mxnet,ZihengJiang/mxnet,antoan2/incubator-mxnet,thirdwing/mxnet,apache/incubator-mxnet,solin319/incubator-mxnet,reminisce/mxnet,rishita/mxnet,apache/incubator-mxnet,crazy-cat/incubator-mxnet,stefanhenneking/mxnet,Northrend/mxnet,likelyzhao/mxnet,LinkHS/incubator-mxnet,ykim362/mxnet,reminisce/mxnet,yuruofeifei/mxnet,ptrendx/mxnet,rishita/mxnet,Prasad9/incubator-mxnet,navrasio/mxnet,piiswrong/mxnet,luoyetx/mxnet,formath/mxnet,dmlc/mxnet,sxjscience/mxnet,dmlc/mxnet,rahul003/mxnet,indhub/mxnet,kevinthesun/mxnet,weleen/mxnet,luoyetx/mxnet,piiswrong/mxnet,nicklhy/mxnet,tlby/mxnet,coder-james/mxnet,smolix/incubator-mxnet,madjam/mxnet,CodingCat/mxnet,Mega-DatA-Lab/mxnet,stefanhenneking/mxnet,leezu/mxnet,madjam/mxnet,navrasio/mxnet,kevinthesun/mxnet,hesseltuinhof/mxnet,rishita/mxnet,dmlc/mxnet,navrasio/mxnet,sxjscience/mxnet,ZihengJiang/mxnet,ykim362/mxnet,jermainewang/mxnet,kevinthesun/mxnet,sergeykolychev/mxnet,ZihengJiang/mxnet,TuSimple/mxnet,mbaijal/incubator-mxnet,hesseltuinhof/mxnet,xcgoner/dist-mxnet,Northrend/mxnet,arank/mxnet,yajiedesign/mxnet,jennyzhang0215/incubator-mxnet,arank/mxnet,sxjscience/mxnet,madjam/mxnet,yuruofeifei/mxnet,vikingMei/mxnet,hotpxl/mxnet,Mega-DatA-Lab/mxnet,Guneet-Dhillon/mxnet,gautamkmr/incubator-mxnet,vikingMei/mxnet,solin319/incubator-mxnet,Mega-DatA-Lab/mxnet,precedenceguo/mxnet,stefanhenneking/mxnet,hesseltuinhof/mxnet,dmlc/mxnet,yuruofeifei/mxnet,jiajiechen/mxnet,nicklhy/mxnet,pluskid/mxnet,indhub/mxnet,luoyetx/mxnet,likelyzhao/mxnet,kevinthesun/mxnet,mbaijal/incubator-mxnet,szha/mxnet,rahul003/mxnet,LinkHS/incubator-mxnet,jermainewang/mxnet,Prasad9/incubator-mxnet,wangyum/mxnet,leezu/mxnet,yajiedesign/mxnet,gautamkmr/incubator-mxnet,Prasad9/incubator-mxnet,Prasad9/incubator-mxnet,kkk669/mxnet,jamesliu/mxnet,kevinthesun/mxnet,formath/mxnet,sergeykolychev/mxnet,ShownX/incubator-mxnet,tlby/mxnet,antoan2/incubator-mxnet,gautamkmr/incubator-mxnet,zhreshold/mxnet,sxjscience/mxnet,reminisce/mxnet,zhreshold/mxnet,arikpoz/mxnet,fullfanta/mxnet,ptrendx/mxnet,ZihengJiang/mxnet,LinkHS/incubator-mxnet,ZihengJiang/mxnet,Mega-DatA-Lab/mxnet,crazy-cat/incubator-mxnet,szha/mxnet,gautamkmr/incubator-mxnet,eric-haibin-lin/mxnet,TuSimple/mxnet,hotpxl/mxnet,saurabh3949/mxnet,eric-haibin-lin/mxnet,hotpxl/mxnet,kkk669/mxnet,ForkedReposBak/mxnet,Northrend/mxnet,nicklhy/mxnet,eric-haibin-lin/mxnet,tornadomeet/mxnet,hpi-xnor/BMXNet,rishita/mxnet,jermainewang/mxnet,weleen/mxnet,EvanzzzZ/mxnet,apaleyes/mxnet,apaleyes/mxnet,solin319/incubator-mxnet,jiajiechen/mxnet,arikpoz/mxnet,ForkedReposBak/mxnet,coder-james/mxnet,wangyum/mxnet,jennyzhang0215/incubator-mxnet,xcgoner/dist-mxnet,EvanzzzZ/mxnet,Guneet-Dhillon/mxnet,madjam/mxnet,saurabh3949/mxnet,arank/mxnet,Northrend/mxnet,gautamkmr/incubator-mxnet,jiajiechen/mxnet,Ldpe2G/mxnet,ptrendx/mxnet,danithaca/mxnet,saurabh3949/mxnet,fullfanta/mxnet,pluskid/mxnet,reminisce/mxnet,solin319/incubator-mxnet,thirdwing/mxnet,thirdwing/mxnet,eric-haibin-lin/mxnet,stefanhenneking/mxnet,ykim362/mxnet,coder-james/mxnet,thirdwing/mxnet,tornadomeet/mxnet,arank/mxnet,kevinthesun/mxnet,jamesliu/mxnet,ForkedReposBak/mxnet,smolix/incubator-mxnet,hotpxl/mxnet,stefanhenneking/mxnet,Guneet-Dhillon/mxnet,danithaca/mxnet,likelyzhao/mxnet,rishita/mxnet,CodingCat/mxnet,arikpoz/mxnet,ShownX/incubator-mxnet,CodingCat/mxnet,yajiedesign/mxnet,EvanzzzZ/mxnet,hpi-xnor/BMXNet,saurabh3949/mxnet,jiajiechen/mxnet,mbaijal/incubator-mxnet,dmlc/mxnet,danithaca/mxnet,apaleyes/mxnet,fullfanta/mxnet,apaleyes/mxnet,navrasio/mxnet,indhub/mxnet,piiswrong/mxnet,vikingMei/mxnet,Mega-DatA-Lab/mxnet,lxn2/mxnet,yuruofeifei/mxnet,arikpoz/mxnet,zhreshold/mxnet,tornadomeet/mxnet,lxn2/mxnet,saurabh3949/mxnet,zhreshold/mxnet,rahul003/mxnet,zhreshold/mxnet,hesseltuinhof/mxnet,smolix/incubator-mxnet,saurabh3949/mxnet,hpi-xnor/BMXNet,Ldpe2G/mxnet,eric-haibin-lin/mxnet,formath/mxnet,yajiedesign/mxnet,larroy/mxnet,solin319/incubator-mxnet,Prasad9/incubator-mxnet,zhreshold/mxnet,precedenceguo/mxnet,DR08/mxnet,rahul003/mxnet,jermainewang/mxnet,jamesliu/mxnet,sergeykolychev/mxnet,vikingMei/mxnet,ptrendx/mxnet,weleen/mxnet,Prasad9/incubator-mxnet,thirdwing/mxnet,nicklhy/mxnet,luoyetx/mxnet,likelyzhao/mxnet,nicklhy/mxnet,tlby/mxnet,larroy/mxnet,lxn2/mxnet,CodingCat/mxnet,likelyzhao/mxnet,leezu/mxnet,LinkHS/incubator-mxnet,ykim362/mxnet,Prasad9/incubator-mxnet,navrasio/mxnet,madjam/mxnet,Mega-DatA-Lab/mxnet,solin319/incubator-mxnet,navrasio/mxnet,indhub/mxnet,szha/mxnet,Ldpe2G/mxnet,dmlc/mxnet,yuruofeifei/mxnet,lxn2/mxnet,TuSimple/mxnet,yuruofeifei/mxnet,ykim362/mxnet,sergeykolychev/mxnet,arikpoz/mxnet,DickJC123/mxnet,luoyetx/mxnet,larroy/mxnet,szha/mxnet,zhreshold/mxnet,jennyzhang0215/incubator-mxnet,wangyum/mxnet,EvanzzzZ/mxnet,smolix/incubator-mxnet,ForkedReposBak/mxnet,danithaca/mxnet,precedenceguo/mxnet,TuSimple/mxnet,luoyetx/mxnet,xcgoner/dist-mxnet,dmlc/mxnet,piiswrong/mxnet,mbaijal/incubator-mxnet,madjam/mxnet,kkk669/mxnet,indhub/mxnet,mbaijal/incubator-mxnet,eric-haibin-lin/mxnet,sergeykolychev/mxnet,jennyzhang0215/incubator-mxnet,coder-james/mxnet,formath/mxnet,tornadomeet/mxnet,ShownX/incubator-mxnet,pluskid/mxnet,kevinthesun/mxnet,yuruofeifei/mxnet,xcgoner/dist-mxnet,saurabh3949/mxnet,precedenceguo/mxnet,formath/mxnet,vikingMei/mxnet,formath/mxnet,kevinthesun/mxnet,CodingCat/mxnet,arikpoz/mxnet,Ldpe2G/mxnet,leezu/mxnet,sxjscience/mxnet,gautamkmr/incubator-mxnet,piiswrong/mxnet,danithaca/mxnet,crazy-cat/incubator-mxnet,Prasad9/incubator-mxnet,kkk669/mxnet