setup-vms.h: post VMS patch cleanup - III

- rename post-config-vms.h to setup-vms.h
- move its inclusion into proper location in curl_setup.h

lib/curl_setup.h

@@ -40,11 +40,6 @@
 
 #include "curl_config.h"
 
-/* VMS needs some helper routines/definitions */
-#ifdef __VMS
-#  include "post-config-vms.h"
-#endif
-
 #else /* HAVE_CONFIG_H */
 
 #ifdef _WIN32_WCE
@@ -234,6 +229,14 @@
 #  include "setup-os400.h"
 #endif
 
+/*
+ * VMS setup file includes some system headers.
+ */
+
+#ifdef __VMS
+#  include "setup-vms.h"
+#endif
+
 /*
  * Include header files for windows builds before redefining anything.
  * Use this preprocessor block only to include or exclude windows.h,