Fix MariaDB wasnings on Windows (rmdir not defined unless direct.h is included)

storage/maria/unittest/ma_maria_log_cleanup.c

@@ -15,6 +15,9 @@
 
 #include "../maria_def.h"
 #include <my_dir.h>
+#ifdef _WIN32
+#include <direct.h> /* rmdir */
+#endif
 
 my_bool maria_log_remove(const char *testdir)
 {

storage/maria/unittest/test_file.h

@@ -15,7 +15,9 @@
 
 #include <m_string.h>
 #include "../ma_pagecache.h"
-
+#ifdef _WIN32
+#include <direct.h>
+#endif
 /*
   File content descriptor
 */