Remove generated makefiles on linux when running gyp_v8

BUG=331475
R=machenbach@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/108293006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18460 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

build/gyp_v8

@@ -159,6 +159,9 @@ if __name__ == '__main__':
   # Generate for the architectures supported on the given platform.
   gyp_args = list(args)
   if platform.system() == 'Linux':
+    # Work around for crbug.com/331475.
+    for f in glob.glob(os.path.join(v8_root, 'out', 'Makefile.*')):
+      os.unlink(f)
     # --generator-output defines where the Makefile goes.
     gyp_args.append('--generator-output=out')
     # -Goutput_dir defines where the build output goes, relative to the