linux: allow builds to override libdir path
linux: allow builds to override libdir path

Not all multilibs install into /usr/lib/, so when building for one which
doesn't, we hit errors where the detected python arch does not match the
detected target arch.  Like x86_64/powerpc64/sparc64/etc... which use
/usr/lib64/.

Review URL: http://codereview.chromium.org/8018002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@103422 0039d316-1c4b-4281-b951-d872f2087c98

M4sse/chromium.src,hujiajie/pa-chromium,anirudhSK/chromium,patrickm/chromium.src,pozdnyakov/chromium-crosswalk,ondra-novak/chromium.src,ondra-novak/chromium.src,rogerwang/chromium,hgl888/chromium-crosswalk-efl,bright-sparks/chromium-spacewalk,PeterWangIntel/chromium-crosswalk,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,junmin-zhu/chromium-rivertrail,crosswalk-project/chromium-crosswalk-efl,zcbenz/cefode-chromium,bright-sparks/chromium-spacewalk,rogerwang/chromium,fujunwei/chromium-crosswalk,Jonekee/chromium.src,axinging/chromium-crosswalk,nacl-webkit/chrome_deps,timopulkkinen/BubbleFish,mogoweb/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,ondra-novak/chromium.src,dushu1203/chromium.src,jaruba/chromium.src,Pluto-tv/chromium-crosswalk,M4sse/chromium.src,patrickm/chromium.src,hgl888/chromium-crosswalk-efl,pozdnyakov/chromium-crosswalk,bright-sparks/chromium-spacewalk,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,zcbenz/cefode-chromium,mogoweb/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,dushu1203/chromium.src,anirudhSK/chromium,bright-sparks/chromium-spacewalk,M4sse/chromium.src,dednal/chromium.src,nacl-webkit/chrome_deps,dednal/chromium.src,Fireblend/chromium-crosswalk,nacl-webkit/chrome_deps,timopulkkinen/BubbleFish,Jonekee/chromium.src,fujunwei/chromium-crosswalk,ondra-novak/chromium.src,patrickm/chromium.src,ChromiumWebApps/chromium,hujiajie/pa-chromium,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,Pluto-tv/chromium-crosswalk,robclark/chromium,hgl888/chromium-crosswalk,ChromiumWebApps/chromium,axinging/chromium-crosswalk,robclark/chromium,chuan9/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,pozdnyakov/chromium-crosswalk,hgl888/chromium-crosswalk,dushu1203/chromium.src,fujunwei/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,keishi/chromium,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,dushu1203/chromium.src,Pluto-tv/chromium-crosswalk,littlstar/chromium.src,patrickm/chromium.src,zcbenz/cefode-chromium,pozdnyakov/chromium-crosswalk,Jonekee/chromium.src,Fireblend/chromium-crosswalk,Chilledheart/chromium,timopulkkinen/BubbleFish,crosswalk-project/chromium-crosswalk-efl,pozdnyakov/chromium-crosswalk,fujunwei/chromium-crosswalk,Just-D/chromium-1,hgl888/chromium-crosswalk-efl,littlstar/chromium.src,ChromiumWebApps/chromium,robclark/chromium,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,Pluto-tv/chromium-crosswalk,patrickm/chromium.src,hujiajie/pa-chromium,PeterWangIntel/chromium-crosswalk,anirudhSK/chromium,dushu1203/chromium.src,zcbenz/cefode-chromium,Fireblend/chromium-crosswalk,chuan9/chromium-crosswalk,Pluto-tv/chromium-crosswalk,fujunwei/chromium-crosswalk,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,axinging/chromium-crosswalk,hgl888/chromium-crosswalk-efl,M4sse/chromium.src,timopulkkinen/BubbleFish,timopulkkinen/BubbleFish,dednal/chromium.src,Just-D/chromium-1,robclark/chromium,M4sse/chromium.src,mohamed--abdel-maksoud/chromium.src,TheTypoMaster/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,littlstar/chromium.src,pozdnyakov/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,keishi/chromium,junmin-zhu/chromium-rivertrail,robclark/chromium,axinging/chromium-crosswalk,junmin-zhu/chromium-rivertrail,Jonekee/chromium.src,robclark/chromium,axinging/chromium-crosswalk,ltilve/chromium,hgl888/chromium-crosswalk,axinging/chromium-crosswalk,ltilve/chromium,nacl-webkit/chrome_deps,mohamed--abdel-maksoud/chromium.src,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,Pluto-tv/chromium-crosswalk,zcbenz/cefode-chromium,timopulkkinen/BubbleFish,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,hujiajie/pa-chromium,Jonekee/chromium.src,mohamed--abdel-maksoud/chromium.src,junmin-zhu/chromium-rivertrail,junmin-zhu/chromium-rivertrail,keishi/chromium,ChromiumWebApps/chromium,littlstar/chromium.src,PeterWangIntel/chromium-crosswalk,nacl-webkit/chrome_deps,anirudhSK/chromium,bright-sparks/chromium-spacewalk,axinging/chromium-crosswalk,timopulkkinen/BubbleFish,krieger-od/nwjs_chromium.src,fujunwei/chromium-crosswalk,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,rogerwang/chromium,timopulkkinen/BubbleFish,pozdnyakov/chromium-crosswalk,M4sse/chromium.src,timopulkkinen/BubbleFish,Jonekee/chromium.src,anirudhSK/chromium,mohamed--abdel-maksoud/chromium.src,dednal/chromium.src,Jonekee/chromium.src,junmin-zhu/chromium-rivertrail,dednal/chromium.src,patrickm/chromium.src,keishi/chromium,markYoungH/chromium.src,ChromiumWebApps/chromium,M4sse/chromium.src,anirudhSK/chromium,hujiajie/pa-chromium,jaruba/chromium.src,markYoungH/chromium.src,mogoweb/chromium-crosswalk,pozdnyakov/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,junmin-zhu/chromium-rivertrail,hujiajie/pa-chromium,jaruba/chromium.src,fujunwei/chromium-crosswalk,markYoungH/chromium.src,rogerwang/chromium,robclark/chromium,dushu1203/chromium.src,mogoweb/chromium-crosswalk,jaruba/chromium.src,rogerwang/chromium,zcbenz/cefode-chromium,ChromiumWebApps/chromium,anirudhSK/chromium,zcbenz/cefode-chromium,pozdnyakov/chromium-crosswalk,robclark/chromium,mohamed--abdel-maksoud/chromium.src,TheTypoMaster/chromium-crosswalk,Just-D/chromium-1,markYoungH/chromium.src,littlstar/chromium.src,hgl888/chromium-crosswalk,ChromiumWebApps/chromium,crosswalk-project/chromium-crosswalk-efl,ChromiumWebApps/chromium,chuan9/chromium-crosswalk,markYoungH/chromium.src,dednal/chromium.src,ChromiumWebApps/chromium,rogerwang/chromium,hujiajie/pa-chromium,krieger-od/nwjs_chromium.src,bright-sparks/chromium-spacewalk,ltilve/chromium,littlstar/chromium.src,Just-D/chromium-1,littlstar/chromium.src,Fireblend/chromium-crosswalk,ondra-novak/chromium.src,Jonekee/chromium.src,ondra-novak/chromium.src,rogerwang/chromium,chuan9/chromium-crosswalk,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,hgl888/chromium-crosswalk,keishi/chromium,zcbenz/cefode-chromium,rogerwang/chromium,dushu1203/chromium.src,axinging/chromium-crosswalk,keishi/chromium,ltilve/chromium,PeterWangIntel/chromium-crosswalk,Just-D/chromium-1,hgl888/chromium-crosswalk,hgl888/chromium-crosswalk-efl,timopulkkinen/BubbleFish,ondra-novak/chromium.src,junmin-zhu/chromium-rivertrail,mogoweb/chromium-crosswalk,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,mogoweb/chromium-crosswalk,krieger-od/nwjs_chromium.src,jaruba/chromium.src,krieger-od/nwjs_chromium.src,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,ltilve/chromium,timopulkkinen/BubbleFish,Chilledheart/chromium,TheTypoMaster/chromium-crosswalk,ondra-novak/chromium.src,Chilledheart/chromium,littlstar/chromium.src,M4sse/chromium.src,jaruba/chromium.src,ondra-novak/chromium.src,dednal/chromium.src,Pluto-tv/chromium-crosswalk,nacl-webkit/chrome_deps,ChromiumWebApps/chromium,mogoweb/chromium-crosswalk,keishi/chromium,markYoungH/chromium.src,chuan9/chromium-crosswalk,nacl-webkit/chrome_deps,nacl-webkit/chrome_deps,hujiajie/pa-chromium,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk,fujunwei/chromium-crosswalk,markYoungH/chromium.src,markYoungH/chromium.src,Chilledheart/chromium,dednal/chromium.src,nacl-webkit/chrome_deps,dednal/chromium.src,keishi/chromium,dushu1203/chromium.src,dednal/chromium.src,Fireblend/chromium-crosswalk,hujiajie/pa-chromium,jaruba/chromium.src,TheTypoMaster/chromium-crosswalk,Just-D/chromium-1,anirudhSK/chromium,pozdnyakov/chromium-crosswalk,keishi/chromium,ltilve/chromium,anirudhSK/chromium,keishi/chromium,Just-D/chromium-1,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,hujiajie/pa-chromium,jaruba/chromium.src,rogerwang/chromium,ltilve/chromium,bright-sparks/chromium-spacewalk,zcbenz/cefode-chromium,patrickm/chromium.src,jaruba/chromium.src,M4sse/chromium.src,Jonekee/chromium.src,markYoungH/chromium.src,robclark/chromium,axinging/chromium-crosswalk,mogoweb/chromium-crosswalk,Fireblend/chromium-crosswalk,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,nacl-webkit/chrome_deps,markYoungH/chromium.src,crosswalk-project/chromium-crosswalk-efl,junmin-zhu/chromium-rivertrail,markYoungH/chromium.src,M4sse/chromium.src,TheTypoMaster/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,dushu1203/chromium.src,PeterWangIntel/chromium-crosswalk,keishi/chromium,anirudhSK/chromium,dushu1203/chromium.src,Just-D/chromium-1,Chilledheart/chromium,pozdnyakov/chromium-crosswalk,ltilve/chromium,zcbenz/cefode-chromium,Fireblend/chromium-crosswalk,chuan9/chromium-crosswalk,robclark/chromium,mogoweb/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,jaruba/chromium.src,anirudhSK/chromium,Fireblend/chromium-crosswalk,junmin-zhu/chromium-rivertrail,dushu1203/chromium.src,chuan9/chromium-crosswalk,Fireblend/chromium-crosswalk,Just-D/chromium-1,hujiajie/pa-chromium,Chilledheart/chromium,Chilledheart/chromium,dednal/chromium.src,nacl-webkit/chrome_deps,jaruba/chromium.src,zcbenz/cefode-chromium,ltilve/chromium,junmin-zhu/chromium-rivertrail,mogoweb/chromium-crosswalk,patrickm/chromium.src,patrickm/chromium.src,Jonekee/chromium.src,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk-efl,Chilledheart/chromium,TheTypoMaster/chromium-crosswalk,anirudhSK/chromium,rogerwang/chromium,fujunwei/chromium-crosswalk