db_shutdown_driver(): clean up code

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@47972 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/db/dbmi_client/shutdown.c

@@ -14,11 +14,6 @@
 
 #include <stdlib.h>
 
-#ifdef __MINGW32__
-#include <process.h>
-#else
-#include <sys/wait.h>
-#endif
 #include <grass/dbmi.h>
 #include <grass/spawn.h>
 #include "macros.h"