Fix for folly open source build on Ubuntu 12.04
Fix for folly open source build on Ubuntu 12.04

Summary: On 12.04, there's both /usr/lib/libiberty.a and /usr/lib/libiberty_pic.a, and _pic is the one we want to build a Folly shared library.

Test Plan: build on Ubuntu 12.04

Reviewed By: meyering@fb.com

FB internal diff: D1402194

project-zerus/folly,Hincoin/folly,clearlinux/folly,project-zerus/folly,ykarlsbrun/folly,brunomorishita/folly,colemancda/folly,lifei/folly,floxard/folly,zhiweicai/folly,clearlylin/folly,renyinew/folly,guker/folly,loverszhaokai/folly,SammyK/folly,renyinew/folly,juniway/folly,facebook/folly,upsoft/folly,charsyam/folly,chjp2046/folly,kernelim/folly,Orvid/folly,raphaelamorim/folly,tomhughes/folly,arg0/folly,tempbottle/folly,loverszhaokai/folly,wildinto/folly,loverszhaokai/folly,sonnyhu/folly,rklabs/folly,hongliangzhao/folly,yangjin-unique/folly,sakishum/folly,nickhen/folly,tempbottle/folly,sakishum/folly,constantine001/folly,rklabs/folly,SammyK/folly,Hincoin/folly,sonnyhu/folly,chjp2046/folly,gavioto/folly,stonegithubs/folly,yangjin-unique/folly,bikong2/folly,clearlinux/folly,doctaweeks/folly,upsoft/folly,alexst07/folly,Hincoin/folly,romange/folly,floxard/folly,bsampath/folly,raphaelamorim/folly,Orvid/folly,gavioto/folly,constantine001/folly,leolujuyi/folly,nickhen/folly,facebook/folly,chjp2046/folly,Eagle-X/folly,cppfool/folly,Eagle-X/folly,juniway/folly,rklabs/folly,colemancda/folly,nickhen/folly,alexst07/folly,theiver9827/folly,PPC64/folly,hongliangzhao/folly,gaoyingie/folly,sonnyhu/folly,constantine001/folly,clearlinux/folly,PPC64/folly,colemancda/folly,bikong2/folly,raphaelamorim/folly,bobegir/folly,sakishum/folly,cole14/folly,lifei/folly,KSreeHarsha/folly,colemancda/folly,charsyam/folly,guker/folly,CJstar/folly,bowlofstew/folly,theiver9827/folly,stonegithubs/folly,rklabs/folly,romange/folly,PoisonBOx/folly,xzmagic/folly,charsyam/folly,sonnyhu/folly,bikong2/folly,theiver9827/folly,reddit/folly,loversInJapan/folly,doctaweeks/folly,renyinew/folly,leolujuyi/folly,brunomorishita/folly,xzmagic/folly,leolujuyi/folly,doctaweeks/folly,yangjin-unique/folly,bobegir/folly,loversInJapan/folly,ykarlsbrun/folly,stonegithubs/folly,yangjin-unique/folly,sakishum/folly,SammyK/folly,Orvid/folly,reddit/folly,theiver9827/folly,mqeizi/folly,PoisonBOx/folly,brunomorishita/folly,tomhughes/folly,arg0/folly,CJstar/folly,CJstar/folly,tempbottle/folly,hongliangzhao/folly,guker/folly,xzmagic/folly,ykarlsbrun/folly,lifei/folly,bsampath/folly,gavioto/folly,kernelim/folly,gavioto/folly,shaobz/folly,brunomorishita/folly,alexst07/folly,yangjin-unique/folly,Eagle-X/folly,juniway/folly,KSreeHarsha/folly,cppfool/folly,KSreeHarsha/folly,theiver9827/folly,floxard/folly,bobegir/folly,cppfool/folly,cppfool/folly,fw1121/folly,clearlylin/folly,sakishum/folly,chjp2046/folly,guker/folly,SammyK/folly,reddit/folly,wildinto/folly,Orvid/folly,gaoyingie/folly,clearlylin/folly,kernelim/folly,CJstar/folly,Eagle-X/folly,charsyam/folly,tempbottle/folly,PoisonBOx/folly,clearlylin/folly,xzmagic/folly,KSreeHarsha/folly,fw1121/folly,project-zerus/folly,fw1121/folly,gavioto/folly,juniway/folly,Hincoin/folly,renyinew/folly,loverszhaokai/folly,cole14/folly,Orvid/folly,SeanRBurton/folly,mqeizi/folly,loversInJapan/folly,shaobz/folly,SeanRBurton/folly,romange/folly,bsampath/folly,KSreeHarsha/folly,SeanRBurton/folly,cppfool/folly,tomhughes/folly,gaoyingie/folly,cole14/folly,kernelim/folly,bowlofstew/folly,clearlinux/folly,stonegithubs/folly,bowlofstew/folly,arg0/folly,cole14/folly,xzmagic/folly,project-zerus/folly,floxard/folly,renyinew/folly,constantine001/folly,PPC64/folly,facebook/folly,leolujuyi/folly,reddit/folly,loverszhaokai/folly,fw1121/folly,PPC64/folly,facebook/folly,PPC64/folly,nickhen/folly,wildinto/folly,colemancda/folly,hongliangzhao/folly,mqeizi/folly,shaobz/folly,loversInJapan/folly,cole14/folly,alexst07/folly,brunomorishita/folly,bikong2/folly,romange/folly,zhiweicai/folly,lifei/folly,bowlofstew/folly,doctaweeks/folly,PoisonBOx/folly,tomhughes/folly,stonegithubs/folly,zhiweicai/folly,loversInJapan/folly,bowlofstew/folly,ykarlsbrun/folly,zhiweicai/folly,gaoyingie/folly,PoisonBOx/folly,Hincoin/folly,chjp2046/folly,facebook/folly,upsoft/folly,bobegir/folly,shaobz/folly,upsoft/folly,project-zerus/folly,bsampath/folly,raphaelamorim/folly,wildinto/folly,mqeizi/folly,guker/folly,leolujuyi/folly,bikong2/folly,fw1121/folly,clearlylin/folly,gaoyingie/folly,bsampath/folly,lifei/folly,CJstar/folly,alexst07/folly,mqeizi/folly,sonnyhu/folly,floxard/folly,arg0/folly,SeanRBurton/folly,clearlinux/folly,juniway/folly,constantine001/folly,reddit/folly,raphaelamorim/folly,rklabs/folly,SeanRBurton/folly,doctaweeks/folly,upsoft/folly,wildinto/folly,shaobz/folly,zhiweicai/folly,arg0/folly,kernelim/folly,tempbottle/folly,bobegir/folly,nickhen/folly,hongliangzhao/folly,ykarlsbrun/folly,Eagle-X/folly,romange/folly,tomhughes/folly,SammyK/folly