[MIPS] Enhance MIPS testing on its buildbot

buildbot/buildbot_lib.py

Index: buildbot/buildbot_lib.py
diff --git a/buildbot/buildbot_lib.py b/buildbot/buildbot_lib.py
index eebedc2dd778f247dde919b502b3f3b8dbb66b31..232bdc7a66b7b930ed74bdcb240274eb0d8388f4 100644
--- a/buildbot/buildbot_lib.py
+++ b/buildbot/buildbot_lib.py
@@ -25,6 +25,10 @@ ARCH_MAP = {
         'gyp_arch': 'arm',
         'scons_platform': 'arm',
         },
+    'mips32': {
+        'gyp_arch': 'mips32',
+        'scons_platform': 'mips32',
+        },
     }