Set -fmsc-version for the Windows Clang build

It's important that -fmsc-version matches the version of VS that we're
falling back to. In practive, this should always be 2013 these days.

BUG=82385
NOTRY=true

Review URL: https://codereview.chromium.org/151663004

git-svn-id: http://src.chromium.org/svn/trunk/src/build@250511 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -4710,6 +4710,22 @@
                   '-ferror-limit=1',
                 ],
               },
+              'conditions': [
+                ['MSVS_VERSION=="2013" or MSVS_VERSION=="2013e"', {
+                  'VCCLCompilerTool': {
+                    'AdditionalOptions': [
+                      '-fmsc-version=1800',
+                    ],
+                  },
+                }],
+                ['MSVS_VERSION=="2010" or MSVS_VERSION=="2010e"', {
+                  'VCCLCompilerTool': {
+                    'AdditionalOptions': [
+                      '-fmsc-version=1600',
+                    ],
+                  },
+                }],
+              ],
             }],
           ],
         },