Set MinimumRequiredVersion for XP support on x86 builds.

BUG=297971
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/140623005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@249318 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -2642,6 +2642,7 @@
         'abstract': 1,
         'msvs_settings': {
           'VCLinkerTool': {
+            'MinimumRequiredVersion': '5.01',  # XP.
             'TargetMachine': '1',
           },
           'VCLibrarianTool': {