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

src/trusted/validator/x86/validate_x86.gyp

Index: src/trusted/validator/x86/validate_x86.gyp
diff --git a/src/trusted/validator/x86/validate_x86.gyp b/src/trusted/validator/x86/validate_x86.gyp
index d3e4f47bcb2183ab655aaba16aea187c20fa5109..c933118c8dc4aa159448ae113e586df29354b1e3 100644
--- a/src/trusted/validator/x86/validate_x86.gyp
+++ b/src/trusted/validator/x86/validate_x86.gyp
@@ -138,5 +138,8 @@
     [ 'target_arch=="arm"', {
       'targets': []
     }],
+    [ 'target_arch=="mipsel"', {
+      'targets': []
+    }],
   ],
 }