Don't use -fno-ident for Clang builds in Release mode on Linux.

It's not supported by Clang and causes a ton of "argument unused
during compilation" warnings.

BUG=none
TEST=everything still builds

Review URL: http://codereview.chromium.org/3614013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@62381 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/build/common.gypi b/build/common.gypi
index 3f37e4e..9f87a44 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -991,6 +991,11 @@
                   '-Wl,--gc-sections',
                 ],
               }],
+              ['clang==1', {
+                'cflags!': [
+                  '-fno-ident',
+                ],
+              }],
             ]
           },
         },