Fix running on Windows XP

Newer mingw-w64 changed default Windows version compatibility.
Need to specify older behavior for EnumProcesses() to avoid "missing
K32EnumProcesses()" runtime error.

code/sys/sys_win32.c

@@ -20,6 +20,9 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 ===========================================================================
 */
 
+// Use EnumProcesses() with Windows XP compatibility
+#define PSAPI_VERSION 1
+
 #include "../qcommon/q_shared.h"
 #include "../qcommon/qcommon.h"
 #include "sys_local.h"