Properly install gram.h on MSVC builds

This file is now needed by pgAdmin builds, which started
failing since it was missing in the installer builds.

src/tools/msvc/Install.pm

@@ -431,6 +431,8 @@ sub CopyIncludeFiles
         $target . '/include/server/',
         'src/include/', 'pg_config.h', 'pg_config_os.h'
     );
+    CopyFiles('Grammar header', $target . '/include/server/parser/',
+	      'src/backend/parser/', 'gram.h');
     CopySetOfFiles('',[ glob("src\\include\\*.h") ],$target . '/include/server/');
     my $D;
     opendir($D, 'src/include') || croak "Could not opendir on src/include!\n";