cmdutils: fix implicit declaration of SetDllDirectory function

Pre-processor check changed by commiter.

Signed-off-by: James Almer <jamrial@gmail.com>
(cherry picked from commit c32ce247a0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

cmdutils.c

@@ -58,6 +58,9 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 #endif
+#if HAVE_SETDLLDIRECTORY
+#include <windows.h>
+#endif
 
 static int init_report(const char *env);