Half-assed fix to make autoconf bend

- this should make platform detection automagic
- also fixes debian builds that broke in the meantime
- fix osdep_darwin.c

src/osdep_stub.c

@@ -0,0 +1,19 @@
+
+#include <WINGs/WUtil.h>
+
+#include "wconfig.h"
+
+Bool GetCommandForPid(int pid, char ***argv, int *argc)
+{
+	*argv = NULL;
+	*argc = 0;
+	static int notified = 0;
+
+	if (!notified) {
+		wwarning(_("%s is not implemented on this platform; "
+		    "notify wmaker-dev@lists.windowmaker.info"), __FUNCTION__);
+		notified = 1;
+	}
+
+	return False;
+}