[flac] Add missing include to windows_unicode_filenames.c

diff --git a/FLAC/src/windows_unicode_filenames.c b/FLAC/src/windows_unicode_filenames.c
index bf3bfe1..8a7795e 100644 (file)
--- a/FLAC/src/windows_unicode_filenames.c
+++ b/FLAC/src/windows_unicode_filenames.c
@@ -34,6 +34,7 @@
 #endif
 
 #include <io.h>
+#include <stdlib.h>
 #include <windows.h>
 #include "share/windows_unicode_filenames.h"