widl: We no longer need to avoid windows.h in generated headers.

tools/widl/header.c

diff --git a/tools/widl/header.c b/tools/widl/header.c
index fc9cbf1..00d6e76 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -1366,7 +1366,7 @@
   fprintf(header, "#include <rpc.h>\n" );
   fprintf(header, "#include <rpcndr.h>\n\n" );
 
-  fprintf(header, "#if !defined(COM_NO_WINDOWS_H) && !defined(__WINESRC__)\n");
+  fprintf(header, "#ifndef COM_NO_WINDOWS_H\n");
   fprintf(header, "#include <windows.h>\n");
   fprintf(header, "#include <ole2.h>\n");
   fprintf(header, "#endif\n\n");