Clean up Makefile, enable MIPS cross-compilation

build/gyp_v8

Index: build/gyp_v8
diff --git a/build/gyp_v8 b/build/gyp_v8
index 0fe340369475d1e3271efe33a5e479bdbe72ee5a..a926fe8ca34c3b2ae59f8593eee6a3c90944b8cd 100755
--- a/build/gyp_v8
+++ b/build/gyp_v8
@@ -163,21 +163,21 @@ if __name__ == '__main__':
   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)