Adding support for .def files to the windows generator.
Adding support for .def files to the windows generator.

Review URL: http://codereview.chromium.org/100050

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@445 78cadc50-ecff-11dd-a971-7dbc132099af

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