Fix comparison of Xcode version
Fix comparison of Xcode version

The methods _XcodeVersion returns a tuple with two strings (Xcode
version and Xcode build), so we should check the version against
the first value of the tuple.

BUG=None
R=mark@chromium.com

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1848 78cadc50-ecff-11dd-a971-7dbc132099af

bpsinc-native/src_tools_gyp,cysp/gyp,omasanori/gyp,trafi/gyp,omasanori/gyp,pandaxcl/gyp,AOSPU/external_chromium_org_tools_gyp,AWhetter/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,AWhetter/gyp,springmeyer/gyp,trafi/gyp,Chilledheart/gyp,duanhjlt/gyp,ttyangf/pdfium_gyp,LazyCodingCat/gyp,android-ia/platform_external_chromium_org_tools_gyp,xin3liang/platform_external_chromium_org_tools_gyp,bnq4ever/gypgoogle,enkripsi/gyp,ttyangf/pdfium_gyp,Phuehvk/gyp,cchamberlain/gyp,Danath/gyp,sdklite/gyp,bnoordhuis/gyp,Omegaphora/external_chromium_org_tools_gyp,duanhjlt/gyp,ttyangf/pdfium_gyp,carlTLR/gyp,msc-/gyp,AOSPU/external_chromium_org_tools_gyp,mapbox/gyp,duanhjlt/gyp,Chilledheart/gyp,azunite/gyp_20150930,cysp/gyp,bulldy80/gyp_unofficial,tarc/gyp,Omegaphora/external_chromium_org_tools_gyp,bnoordhuis/gyp,azunite/gyp,chromium/gyp,mgamer/gyp,carlTLR/gyp,Jack-Q/GYP-copy,cchamberlain/gyp,Chilledheart/gyp,dougbeal/gyp,sport-monkey/GYP,chromium/gyp,bnq4ever/gypgoogle,trafi/gyp,msc-/gyp,amoikevin/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,Chilledheart/gyp,yjhjstz/gyp,xin3liang/platform_external_chromium_org_tools_gyp,mapbox/gyp,springmeyer/gyp,azunite/gyp_20150930,LazyCodingCat/gyp,mgamer/gyp,pandaxcl/gyp,erikge/watch_gyp,msc-/gyp,dougbeal/gyp,pandaxcl/gyp,erikge/watch_gyp,okumura/gyp,bulldy80/gyp_unofficial,cchamberlain/gyp,ttyangf/gyp,mapbox/gyp,trafi/gyp,ttyangf/gyp,ttyangf/gyp,trafi/gyp,springmeyer/gyp,cysp/gyp,bpsinc-native/src_tools_gyp,AWhetter/gyp,adblockplus/gyp,sanyaade-teachings/gyp,LazyCodingCat/gyp,xin3liang/platform_external_chromium_org_tools_gyp,AOSPU/external_chromium_org_tools_gyp,sanyaade-teachings/gyp,ryfx/gyp,turbulenz/gyp,amoikevin/gyp,pandaxcl/gyp,amoikevin/gyp,carlTLR/gyp,amoikevin/gyp,Omegaphora/external_chromium_org_tools_gyp,carlTLR/gyp,yjhjstz/gyp,openpeer/webrtc-gyp,cysp/gyp,mgamer/gyp,turbulenz/gyp,Omegaphora/external_chromium_org_tools_gyp,turbulenz/gyp,Jack-Q/GYP-copy,Jack-Q/GYP-copy,Jack-Q/GYP-copy,turbulenz/gyp,erikge/watch_gyp,bulldy80/gyp_unofficial,duanhjlt/gyp,adblockplus/gyp,Danath/gyp,yjhjstz/gyp,carlTLR/gyp,openpeer/webrtc-gyp,Chilledheart/gyp,msc-/gyp,sdklite/gyp,springmeyer/gyp,tarc/gyp,AOSPU/external_chromium_org_tools_gyp,android-ia/platform_external_chromium_org_tools_gyp,erikge/watch_gyp,openpeer/webrtc-gyp,Jack-Q/GYP-copy,bnoordhuis/gyp,enkripsi/gyp,enkripsi/gyp,clar/gyp,Danath/gyp,dougbeal/gyp,sport-monkey/GYP,azunite/gyp_20150930,sdklite/gyp,dougbeal/gyp,sanyaade-teachings/gyp,openpeer/webrtc-gyp,azunite/gyp,Phuehvk/gyp,Phuehvk/gyp,xin3liang/platform_external_chromium_org_tools_gyp,AWhetter/gyp,openpeer/webrtc-gyp,saghul/gyn,saghul/gyn,tarc/gyp,ttyangf/pdfium_gyp,cchamberlain/gyp,bpsinc-native/src_tools_gyp,springmeyer/gyp,clar/gyp,okumura/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,bnq4ever/gypgoogle,android-ia/platform_external_chromium_org_tools_gyp,okumura/gyp,yjhjstz/gyp,mapbox/gyp,sanyaade-teachings/gyp,Phuehvk/gyp,adblockplus/gyp,chromium/gyp,ryfx/gyp,sdklite/gyp,tarc/gyp,ryfx/gyp,sanyaade-teachings/gyp,bnoordhuis/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,pandaxcl/gyp,chromium/gyp,chromium/gyp,mgamer/gyp,azunite/gyp,azunite/gyp,ryfx/gyp,amoikevin/gyp,Danath/gyp,sport-monkey/GYP,ryfx/gyp,duanhjlt/gyp,azunite/gyp_20150930,clar/gyp,ttyangf/gyp,enkripsi/gyp,okumura/gyp,bnq4ever/gypgoogle,azunite/gyp_20150930,bpsinc-native/src_tools_gyp,saghul/gyn,android-ia/platform_external_chromium_org_tools_gyp,yjhjstz/gyp,enkripsi/gyp,cchamberlain/gyp,clar/gyp,LazyCodingCat/gyp,mgamer/gyp,ttyangf/pdfium_gyp,tarc/gyp,erikge/watch_gyp,sdklite/gyp,bulldy80/gyp_unofficial,mapbox/gyp,dougbeal/gyp,bulldy80/gyp_unofficial,sport-monkey/GYP,saghul/gyn,omasanori/gyp,clar/gyp,ttyangf/gyp,turbulenz/gyp,AWhetter/gyp,Phuehvk/gyp,bnq4ever/gypgoogle,adblockplus/gyp,bnoordhuis/gyp,cysp/gyp,omasanori/gyp,sport-monkey/GYP,saghul/gyn,msc-/gyp,azunite/gyp,adblockplus/gyp,Danath/gyp,LazyCodingCat/gyp