mac: Support ARCHS with one element in the make and ninja generators.
mac: Support ARCHS with one element in the make and ninja generators.

General ARCHS support (fat binaries) are still unsupported.

BUG=90185,107027
Review URL: http://codereview.chromium.org/9212026

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1161 78cadc50-ecff-11dd-a971-7dbc132099af

Jack-Q/GYP-copy,AWhetter/gyp,azunite/gyp_20150930,LazyCodingCat/gyp,pandaxcl/gyp,alexcrichton/gyp,mkrautz/gyp-libmumble,openpeer/webrtc-gyp,azunite/gyp,enkripsi/gyp,enkripsi/gyp,okumura/gyp,Danath/gyp,springmeyer/gyp,pyokagan/gyp,chromium/gyp,mgamer/gyp,cchamberlain/gyp,svn2github/kgyp,svn2github/gyp,sport-monkey/GYP,erikge/watch_gyp,bulldy80/gyp_unofficial,bdarnell/gyp,Omegaphora/external_chromium_org_tools_gyp,mgamer/gyp,bnoordhuis/gyp,amoikevin/gyp,cysp/gyp,amoikevin/gyp,ryfx/gyp,turbulenz/gyp,kevinchen3315/gyp-git,okwasi/gyp,erikge/watch_gyp,sport-monkey/GYP,pandaxcl/gyp,bnoordhuis/gyp,Chilledheart/gyp,mkrautz/gyp-libmumble,bnq4ever/gypgoogle,AOSPU/external_chromium_org_tools_gyp,channing/gyp,xin3liang/platform_external_chromium_org_tools_gyp,amoikevin/gyp,erikge/watch_gyp,okwasi/gyp,lianliuwei/gyp,bnoordhuis/gyp,bnq4ever/gypgoogle,mistydemeo/gyp,Chilledheart/gyp,mgamer/gyp,ttyangf/gyp,msc-/gyp,adblockplus/gyp,pyokagan/gyp,Chilledheart/gyp,AWhetter/gyp,mapbox/gyp,openpeer/webrtc-gyp,sloanyang/gyp,amoikevin/gyp,sanyaade-teachings/gyp,ttyangf/gyp,bulldy80/gyp_unofficial,adblockplus/gyp,enkripsi/gyp,pandaxcl/gyp,turbulenz/gyp,svn2github/kgyp,yinquan529/platform-external-chromium_org-tools-gyp,cchamberlain/gyp,luvit/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,yjhjstz/gyp,lukeweber/gyp-override,sanyaade-teachings/gyp,pandaxcl/gyp,sloanyang/gyp,azunite/gyp,trafi/gyp,springmeyer/gyp,svn2github/kgyp,mumble-voip/libmumble-gyp,bdarnell/gyp,turbulenz/gyp,omasanori/gyp,mgamer/gyp,luvit/gyp,adblockplus/gyp,svn2github/kgyp,dougbeal/gyp,bdarnell/gyp,luvit/gyp,Phuehvk/gyp,ttyangf/gyp,bpsinc-native/src_tools_gyp,chromium/gyp,yangrongwei/gyp,tarc/gyp,sloanyang/gyp,azunite/gyp_20150930,svn2github/gyp,chromium/gyp,sloanyang/gyp,mumble-voip/libmumble-gyp,channing/gyp,carlTLR/gyp,MIPS/external-chromium_org-tools-gyp,chromium/gyp,adblockplus/gyp,Chilledheart/gyp,Phuehvk/gyp,Omegaphora/external_chromium_org_tools_gyp,chromium/gyp,trafi/gyp,lianliuwei/gyp,brson/gyp,bnq4ever/gypgoogle,pyokagan/gyp,turbulenz/gyp,ttyangf/pdfium_gyp,lianliuwei/gyp,yinquan529/platform-external-chromium_org-tools-gyp,AWhetter/gyp,cchamberlain/gyp,yjhjstz/gyp,svn2github/gyp,saghul/gyn,Jack-Q/GYP-copy,bulldy80/gyp_unofficial,bnoordhuis/gyp,tarc/gyp,alexcrichton/gyp,sanyaade-teachings/gyp,azunite/gyp_20150930,pyokagan/gyp,enkripsi/gyp,ryfx/gyp,dougbeal/gyp,AOSPU/external_chromium_org_tools_gyp,saghul/gyn,clar/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,saghul/gyn,lukeweber/gyp-override,clar/gyp,clar/gyp,LazyCodingCat/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,sdklite/gyp,yinquan529/platform-external-chromium_org-tools-gyp,cchamberlain/gyp,android-ia/platform_external_chromium_org_tools_gyp,mapbox/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,bulldy80/gyp_unofficial,duanhjlt/gyp,enkripsi/gyp,cysp/gyp,sport-monkey/GYP,msc-/gyp,sdklite/gyp,bpsinc-native/src_tools_gyp,ryfx/gyp,dougbeal/gyp,okumura/gyp,mistydemeo/gyp,yinquan529/platform-external-chromium_org-tools-gyp,mkrautz/gyp-libmumble,mapbox/gyp,springmeyer/gyp,carlTLR/gyp,omasanori/gyp,ttyangf/pdfium_gyp,trafi/gyp,okumura/gyp,mistydemeo/gyp,azunite/gyp_20150930,dougbeal/gyp,sdklite/gyp,brson/gyp,azunite/gyp_20150930,mumble-voip/libmumble-gyp,android-ia/platform_external_chromium_org_tools_gyp,sanyaade-teachings/gyp,Phuehvk/gyp,Jack-Q/GYP-copy,openpeer/webrtc-gyp,Danath/gyp,lianliuwei/gyp,LazyCodingCat/gyp,xin3liang/platform_external_chromium_org_tools_gyp,okwasi/gyp,alexcrichton/gyp,LazyCodingCat/gyp,Phuehvk/gyp,Danath/gyp,Jack-Q/GYP-copy,yjhjstz/gyp,trafi/gyp,tarc/gyp,mapbox/gyp,channing/gyp,bnoordhuis/gyp,adblockplus/gyp,clar/gyp,saghul/gyn,azunite/gyp,lukeweber/gyp-override,yjhjstz/gyp,kevinchen3315/gyp-git,MIPS/external-chromium_org-tools-gyp,bnq4ever/gypgoogle,mkrautz/gyp-libmumble,springmeyer/gyp,erikge/watch_gyp,dougbeal/gyp,openpeer/webrtc-gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,amoikevin/gyp,bdarnell/gyp,xin3liang/platform_external_chromium_org_tools_gyp,sport-monkey/GYP,luvit/gyp,bulldy80/gyp_unofficial,mumble-voip/libmumble-gyp,channing/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,mgamer/gyp,duanhjlt/gyp,omasanori/gyp,brson/gyp,Omegaphora/external_chromium_org_tools_gyp,sport-monkey/GYP,yangrongwei/gyp,ttyangf/pdfium_gyp,yangrongwei/gyp,svn2github/kgyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,AOSPU/external_chromium_org_tools_gyp,azunite/gyp,okwasi/gyp,svn2github/gyp,yangrongwei/gyp,omasanori/gyp,sanyaade-teachings/gyp,clar/gyp,msc-/gyp,Danath/gyp,sdklite/gyp,sdklite/gyp,Phuehvk/gyp,mapbox/gyp,ttyangf/pdfium_gyp,cysp/gyp,alexcrichton/gyp,pandaxcl/gyp,ryfx/gyp,ttyangf/gyp,duanhjlt/gyp,kevinchen3315/gyp-git,cysp/gyp,android-ia/platform_external_chromium_org_tools_gyp,bnq4ever/gypgoogle,duanhjlt/gyp,xin3liang/platform_external_chromium_org_tools_gyp,Omegaphora/external_chromium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