[MIPS] Add support to gyp files to build Native Client inside of Chromium

src/trusted/validator_x86/validator_x86.gyp

Index: src/trusted/validator_x86/validator_x86.gyp
diff --git a/src/trusted/validator_x86/validator_x86.gyp b/src/trusted/validator_x86/validator_x86.gyp
index 27a5b0f9ac5c5deb27c17b384023152cbc2e6571..a283c9facc8b771e97040ce98729d0232151c2ab 100644
--- a/src/trusted/validator_x86/validator_x86.gyp
+++ b/src/trusted/validator_x86/validator_x86.gyp
@@ -75,5 +75,8 @@
     [ 'target_arch=="arm"', {
       'targets': []
     }],
+    [ 'target_arch=="mipsel"', {
+      'targets': []
+    }],
   ],
 }