Fix dummy library issue.
Fix dummy library issue.

For Crosswalk build with default option, we only provide libxwalkcore.so.lzma, no dummy library.

BUG=XWALK-4286

dreamsxin/crosswalk,alex-zhang/crosswalk,zeropool/crosswalk,zliang7/crosswalk,RafuCater/crosswalk,hgl888/crosswalk,RafuCater/crosswalk,chuan9/crosswalk,marcuspridham/crosswalk,minggangw/crosswalk,dreamsxin/crosswalk,ZhengXinCN/crosswalk,jondong/crosswalk,minggangw/crosswalk,zliang7/crosswalk,darktears/crosswalk,RafuCater/crosswalk,rakuco/crosswalk,stonegithubs/crosswalk,RafuCater/crosswalk,Pluto-tv/crosswalk,bestwpw/crosswalk,siovene/crosswalk,pk-sam/crosswalk,jondwillis/crosswalk,zeropool/crosswalk,darktears/crosswalk,minggangw/crosswalk,jondwillis/crosswalk,jpike88/crosswalk,Bysmyyr/crosswalk,axinging/crosswalk,zliang7/crosswalk,pk-sam/crosswalk,weiyirong/crosswalk-1,jpike88/crosswalk,jondwillis/crosswalk,darktears/crosswalk,tedshroyer/crosswalk,pk-sam/crosswalk,baleboy/crosswalk,bestwpw/crosswalk,Pluto-tv/crosswalk,chuan9/crosswalk,RafuCater/crosswalk,xzhan96/crosswalk,crosswalk-project/crosswalk,marcuspridham/crosswalk,Bysmyyr/crosswalk,rakuco/crosswalk,Bysmyyr/crosswalk,Bysmyyr/crosswalk,XiaosongWei/crosswalk,stonegithubs/crosswalk,tomatell/crosswalk,zliang7/crosswalk,rakuco/crosswalk,alex-zhang/crosswalk,PeterWangIntel/crosswalk,alex-zhang/crosswalk,darktears/crosswalk,rakuco/crosswalk,xzhan96/crosswalk,marcuspridham/crosswalk,lincsoon/crosswalk,baleboy/crosswalk,ZhengXinCN/crosswalk,zliang7/crosswalk,darktears/crosswalk,heke123/crosswalk,crosswalk-project/crosswalk,axinging/crosswalk,crosswalk-project/crosswalk,chuan9/crosswalk,tomatell/crosswalk,stonegithubs/crosswalk,siovene/crosswalk,jondong/crosswalk,minggangw/crosswalk,jondong/crosswalk,amaniak/crosswalk,hgl888/crosswalk,baleboy/crosswalk,lincsoon/crosswalk,siovene/crosswalk,zeropool/crosswalk,zliang7/crosswalk,bestwpw/crosswalk,chuan9/crosswalk,amaniak/crosswalk,Pluto-tv/crosswalk,RafuCater/crosswalk,stonegithubs/crosswalk,xzhan96/crosswalk,siovene/crosswalk,weiyirong/crosswalk-1,tedshroyer/crosswalk,jpike88/crosswalk,heke123/crosswalk,Pluto-tv/crosswalk,zliang7/crosswalk,marcuspridham/crosswalk,PeterWangIntel/crosswalk,marcuspridham/crosswalk,darktears/crosswalk,tedshroyer/crosswalk,baleboy/crosswalk,jpike88/crosswalk,ZhengXinCN/crosswalk,jondwillis/crosswalk,XiaosongWei/crosswalk,Pluto-tv/crosswalk,amaniak/crosswalk,weiyirong/crosswalk-1,marcuspridham/crosswalk,jondwillis/crosswalk,Bysmyyr/crosswalk,siovene/crosswalk,XiaosongWei/crosswalk,dreamsxin/crosswalk,minggangw/crosswalk,crosswalk-project/crosswalk,Bysmyyr/crosswalk,dreamsxin/crosswalk,siovene/crosswalk,Bysmyyr/crosswalk,lincsoon/crosswalk,bestwpw/crosswalk,axinging/crosswalk,heke123/crosswalk,siovene/crosswalk,heke123/crosswalk,heke123/crosswalk,rakuco/crosswalk,pk-sam/crosswalk,XiaosongWei/crosswalk,ZhengXinCN/crosswalk,xzhan96/crosswalk,jondong/crosswalk,Pluto-tv/crosswalk,weiyirong/crosswalk-1,bestwpw/crosswalk,jondwillis/crosswalk,lincsoon/crosswalk,tomatell/crosswalk,crosswalk-project/crosswalk,PeterWangIntel/crosswalk,XiaosongWei/crosswalk,hgl888/crosswalk,xzhan96/crosswalk,amaniak/crosswalk,heke123/crosswalk,zeropool/crosswalk,crosswalk-project/crosswalk,bestwpw/crosswalk,heke123/crosswalk,amaniak/crosswalk,lincsoon/crosswalk,tomatell/crosswalk,jondong/crosswalk,jondong/crosswalk,xzhan96/crosswalk,hgl888/crosswalk,minggangw/crosswalk,tedshroyer/crosswalk,baleboy/crosswalk,zeropool/crosswalk,baleboy/crosswalk,jondwillis/crosswalk,baleboy/crosswalk,weiyirong/crosswalk-1,hgl888/crosswalk,rakuco/crosswalk,weiyirong/crosswalk-1,xzhan96/crosswalk,bestwpw/crosswalk,marcuspridham/crosswalk,dreamsxin/crosswalk,darktears/crosswalk,ZhengXinCN/crosswalk,Pluto-tv/crosswalk,chuan9/crosswalk,amaniak/crosswalk,rakuco/crosswalk,alex-zhang/crosswalk,hgl888/crosswalk,pk-sam/crosswalk,XiaosongWei/crosswalk,Bysmyyr/crosswalk,PeterWangIntel/crosswalk,alex-zhang/crosswalk,dreamsxin/crosswalk,RafuCater/crosswalk,lincsoon/crosswalk,tedshroyer/crosswalk,axinging/crosswalk,PeterWangIntel/crosswalk,tedshroyer/crosswalk,dreamsxin/crosswalk,stonegithubs/crosswalk,chuan9/crosswalk,tomatell/crosswalk,zliang7/crosswalk,alex-zhang/crosswalk,hgl888/crosswalk,alex-zhang/crosswalk,pk-sam/crosswalk,lincsoon/crosswalk,jpike88/crosswalk,ZhengXinCN/crosswalk,stonegithubs/crosswalk,hgl888/crosswalk,xzhan96/crosswalk,jpike88/crosswalk,XiaosongWei/crosswalk,baleboy/crosswalk,minggangw/crosswalk,darktears/crosswalk,tomatell/crosswalk,lincsoon/crosswalk,zeropool/crosswalk,pk-sam/crosswalk,heke123/crosswalk,chuan9/crosswalk,tedshroyer/crosswalk,axinging/crosswalk,zeropool/crosswalk,jpike88/crosswalk,PeterWangIntel/crosswalk,crosswalk-project/crosswalk,axinging/crosswalk,PeterWangIntel/crosswalk,stonegithubs/crosswalk,marcuspridham/crosswalk,minggangw/crosswalk,weiyirong/crosswalk-1,tomatell/crosswalk,amaniak/crosswalk,jondong/crosswalk,rakuco/crosswalk,ZhengXinCN/crosswalk,crosswalk-project/crosswalk,axinging/crosswalk,jondong/crosswalk