Use exec and proper quoting in top-level gyp command.
Use exec and proper quoting in top-level gyp command.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/74243002

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1787 78cadc50-ecff-11dd-a971-7dbc132099af

bpsinc-native/src_tools_gyp,adblockplus/gyp,saghul/gyn,pyokagan/gyp,AWhetter/gyp,Danath/gyp,sport-monkey/GYP,erikge/watch_gyp,okumura/gyp,clar/gyp,yinquan529/platform-external-chromium_org-tools-gyp,yjhjstz/gyp,Danath/gyp,ttyangf/pdfium_gyp,AWhetter/gyp,amoikevin/gyp,yinquan529/platform-external-chromium_org-tools-gyp,svn2github/gyp,android-ia/platform_external_chromium_org_tools_gyp,bnoordhuis/gyp,tarc/gyp,luvit/gyp,dougbeal/gyp,Omegaphora/external_chromium_org_tools_gyp,openpeer/webrtc-gyp,bnoordhuis/gyp,ttyangf/pdfium_gyp,clar/gyp,chromium/gyp,amoikevin/gyp,AOSPU/external_chromium_org_tools_gyp,bnoordhuis/gyp,ttyangf/pdfium_gyp,bulldy80/gyp_unofficial,pyokagan/gyp,Danath/gyp,sdklite/gyp,Phuehvk/gyp,azunite/gyp_20150930,xin3liang/platform_external_chromium_org_tools_gyp,yjhjstz/gyp,cchamberlain/gyp,azunite/gyp_20150930,saghul/gyn,Omegaphora/external_chromium_org_tools_gyp,chromium/gyp,yjhjstz/gyp,sanyaade-teachings/gyp,mapbox/gyp,Phuehvk/gyp,erikge/watch_gyp,turbulenz/gyp,mgamer/gyp,Jack-Q/GYP-copy,AWhetter/gyp,LazyCodingCat/gyp,cysp/gyp,carlTLR/gyp,sdklite/gyp,azunite/gyp,springmeyer/gyp,cchamberlain/gyp,svn2github/gyp,tarc/gyp,saghul/gyn,cysp/gyp,cysp/gyp,alexcrichton/gyp,okumura/gyp,amoikevin/gyp,duanhjlt/gyp,trafi/gyp,svn2github/kgyp,amoikevin/gyp,erikge/watch_gyp,enkripsi/gyp,bnq4ever/gypgoogle,duanhjlt/gyp,tarc/gyp,omasanori/gyp,amoikevin/gyp,LazyCodingCat/gyp,bnoordhuis/gyp,Danath/gyp,azunite/gyp_20150930,svn2github/kgyp,chromium/gyp,svn2github/gyp,dougbeal/gyp,sport-monkey/GYP,sdklite/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,azunite/gyp_20150930,trafi/gyp,ryfx/gyp,okumura/gyp,Jack-Q/GYP-copy,saghul/gyn,mapbox/gyp,xin3liang/platform_external_chromium_org_tools_gyp,luvit/gyp,azunite/gyp,ttyangf/pdfium_gyp,turbulenz/gyp,cchamberlain/gyp,ttyangf/gyp,Jack-Q/GYP-copy,openpeer/webrtc-gyp,android-ia/platform_external_chromium_org_tools_gyp,LazyCodingCat/gyp,chromium/gyp,mapbox/gyp,erikge/watch_gyp,pyokagan/gyp,Phuehvk/gyp,Chilledheart/gyp,sanyaade-teachings/gyp,msc-/gyp,clar/gyp,ttyangf/gyp,sport-monkey/GYP,mapbox/gyp,azunite/gyp,mistydemeo/gyp,okumura/gyp,bulldy80/gyp_unofficial,enkripsi/gyp,azunite/gyp,mgamer/gyp,Phuehvk/gyp,bpsinc-native/src_tools_gyp,sdklite/gyp,alexcrichton/gyp,duanhjlt/gyp,cysp/gyp,azunite/gyp,alexcrichton/gyp,msc-/gyp,springmeyer/gyp,bnq4ever/gypgoogle,bnoordhuis/gyp,ttyangf/pdfium_gyp,AOSPU/external_chromium_org_tools_gyp,sanyaade-teachings/gyp,msc-/gyp,bulldy80/gyp_unofficial,svn2github/kgyp,ttyangf/gyp,msc-/gyp,trafi/gyp,cchamberlain/gyp,xin3liang/platform_external_chromium_org_tools_gyp,trafi/gyp,AWhetter/gyp,bulldy80/gyp_unofficial,pyokagan/gyp,enkripsi/gyp,android-ia/platform_external_chromium_org_tools_gyp,bnq4ever/gypgoogle,Phuehvk/gyp,luvit/gyp,yjhjstz/gyp,enkripsi/gyp,openpeer/webrtc-gyp,carlTLR/gyp,dougbeal/gyp,trafi/gyp,duanhjlt/gyp,AOSPU/external_chromium_org_tools_gyp,cysp/gyp,sport-monkey/GYP,LazyCodingCat/gyp,springmeyer/gyp,saghul/gyn,ttyangf/gyp,ryfx/gyp,msc-/gyp,mistydemeo/gyp,omasanori/gyp,erikge/watch_gyp,cchamberlain/gyp,AOSPU/external_chromium_org_tools_gyp,yinquan529/platform-external-chromium_org-tools-gyp,pandaxcl/gyp,mapbox/gyp,bpsinc-native/src_tools_gyp,adblockplus/gyp,svn2github/kgyp,enkripsi/gyp,turbulenz/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,pandaxcl/gyp,turbulenz/gyp,carlTLR/gyp,alexcrichton/gyp,sport-monkey/GYP,Chilledheart/gyp,mistydemeo/gyp,svn2github/gyp,sdklite/gyp,adblockplus/gyp,svn2github/gyp,bnq4ever/gypgoogle,sanyaade-teachings/gyp,tarc/gyp,Chilledheart/gyp,azunite/gyp_20150930,android-ia/platform_external_chromium_org_tools_gyp,sanyaade-teachings/gyp,pandaxcl/gyp,adblockplus/gyp,dougbeal/gyp,dougbeal/gyp,xin3liang/platform_external_chromium_org_tools_gyp,Jack-Q/GYP-copy,bulldy80/gyp_unofficial,duanhjlt/gyp,mgamer/gyp,Omegaphora/external_chromium_org_tools_gyp,yjhjstz/gyp,Danath/gyp,Chilledheart/gyp,ryfx/gyp,yinquan529/platform-external-chromium_org-tools-gyp,turbulenz/gyp,omasanori/gyp,tarc/gyp,bnq4ever/gypgoogle,springmeyer/gyp,ryfx/gyp,carlTLR/gyp,AWhetter/gyp,pyokagan/gyp,luvit/gyp,springmeyer/gyp,pandaxcl/gyp,svn2github/kgyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,openpeer/webrtc-gyp,mgamer/gyp,Chilledheart/gyp,pandaxcl/gyp,openpeer/webrtc-gyp,Omegaphora/external_chromium_org_tools_gyp,clar/gyp,clar/gyp,bpsinc-native/src_tools_gyp,carlTLR/gyp,ryfx/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,Jack-Q/GYP-copy,omasanori/gyp,mistydemeo/gyp,chromium/gyp,adblockplus/gyp,mgamer/gyp,ttyangf/gyp,LazyCodingCat/gyp