Enable WinVNC build with MinGW and MinGW64


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4723 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/config.h.in b/config.h.in
index 5f7a4c7..612fab7 100644
--- a/config.h.in
+++ b/config.h.in
@@ -16,6 +16,8 @@
 #cmakedefine HAVE_FLTK_MEDIAKEYS
 #cmakedefine HAVE_FLTK_FULLSCREEN
 #cmakedefine HAVE_FLTK_CURSOR
+#cmakedefine HAVE_ACTIVE_DESKTOP_H
+#cmakedefine HAVE_ACTIVE_DESKTOP_L
 #cmakedefine ENABLE_NLS 1
 #cmakedefine HAVE_PAM