Clean up Makefile, enable MIPS cross-compilation

build/gyp_v8

 #!/usr/bin/python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 145 matching lines @@
 
   # Generate for the architectures supported on the given platform.
   gyp_args = list(args)
   target_arch = None
   for p in gyp_args:
     if p.find('-Dtarget_arch=') == 0:
       target_arch = p
   if target_arch is None:
     gyp_args.append('-Dtarget_arch=ia32')
   if utils.GuessOS() == 'linux':
-    gyp_args.append('-S-ia32')
+    gyp_args.append('-S.ia32')
   run_gyp(gyp_args)
 
   if utils.GuessOS() == 'linux':
     gyp_args = list(args)
     gyp_args.append('-Dtarget_arch=x64')
-    gyp_args.append('-S-x64')
+    gyp_args.append('-S.x64')
     run_gyp(gyp_args)
 
     gyp_args = list(args)
-    gyp_args.append('-I' + v8_root + '/build/armu.gypi')
-    gyp_args.append('-S-armu')
+    gyp_args.append('-Dv8_target_arch=arm')
+    gyp_args.append('-S.arm')
     run_gyp(gyp_args)
 
     gyp_args = list(args)
-    gyp_args.append('-I' + v8_root + '/build/mipsu.gypi')
-    gyp_args.append('-S-mipsu')
+    gyp_args.append('-Dv8_target_arch=mips')
+    gyp_args.append('-S.mips')
     run_gyp(gyp_args)