fix mingw

SchrodingerZhu · SchrodingerZhu · commit 49b89b58e93f · 2020-06-23T10:38:29.000+08:00
diff --git a/src/pal/pal_windows.h b/src/pal/pal_windows.h
@@ -6,6 +6,7 @@
 #ifdef _WIN32
 #  ifndef _MSC_VER
 #    include <cstdio>
+#    include <utility>
 #  endif
 #  define WIN32_LEAN_AND_MEAN
 #  ifndef NOMINMAX
