Revert installation of gram.h in 8.3

To make the buildfarm green again, since there is no file to
copy on msvc, and also given discussion about the necessity
of the file at all...

src/tools/msvc/Install.pm

@@ -380,7 +380,7 @@ sub CopyIncludeFiles
 
     EnsureDirectories($target, 'include', 'include/libpq',
         'include/internal', 'include/internal/libpq',
-        'include/server', 'include/server/parser');
+        'include/server');
 
     CopyFiles(
         'Public headers',
@@ -410,8 +410,6 @@ 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/');