Make sure binutils values are always defined.

BUG=352046

Review URL: https://codereview.chromium.org/228763006

git-svn-id: http://src.chromium.org/svn/trunk/src/build@262981 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -1182,6 +1182,10 @@
     'debug_unwind_tables%': 1,
     'release_unwind_tables%': 1,
 
+    # Override where to find binutils
+    'binutils_version%': 0,
+    'binutils_dir%': '',
+
     # Enable TCMalloc.
     # TODO(dmikurube): Change Linux default of use_allocator to "tcmalloc".
     # TODO(dmikurube): Change Android default of use_allocator to "none".