make_makefiles: Properly skip dlls marked with MKDLL_SKIP.
diff --git a/tools/make_makefiles b/tools/make_makefiles
index d44632f..74b8946 100755
--- a/tools/make_makefiles
+++ b/tools/make_makefiles
@@ -342,6 +342,7 @@
     foreach my $make (@_)
     {
         my %makefile = %{$makefiles{$make}};
+        next if defined $makefile{"=skip"};
 
         if ($make =~ /dlls\/(.*)\/tests\/Makefile/)
         {