Disable syzygy for Win64.

Not sure what the plans are for Win64, but at the moment it chokes on the binary.

R=siggi@chromium.org

Review URL: https://chromiumcodereview.appspot.com/12326065

git-svn-id: http://src.chromium.org/svn/trunk/src/build@184134 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -183,7 +183,7 @@
       'target_name': 'All_syzygy',
       'type': 'none',
       'conditions': [
-        ['OS=="win" and fastbuild==0', {
+        ['OS=="win" and fastbuild==0 and target_arch=="ia32"', {
             'dependencies': [
               '../chrome/installer/mini_installer_syzygy.gyp:*',
             ],