Bunch More Work, mostly cleanup and organization.

Wanted to do this now before it gets out of hand.

Ideally, this can be used for a Winelib-like option eventually, too, where you
don't load OS/2 binaries at all but rather compile and link your OS/2-based
source code against this API reimplementation.

native/msg.h

@@ -0,0 +1,19 @@
+#ifndef _INCL_MSG_H_
+#define _INCL_MSG_H_
+
+#include "os2types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+APIRET OS2API DosPutMessage(HFILE hfile, ULONG cbMsg, PCHAR pBuf);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+// end of msg.h ...
+