include/msvcrt: Update a bit.
diff --git a/include/msvcrt/crtdefs.h b/include/msvcrt/crtdefs.h
index 61116e9..1f51937 100644
--- a/include/msvcrt/crtdefs.h
+++ b/include/msvcrt/crtdefs.h
@@ -172,3 +172,8 @@
 typedef unsigned short  wctype_t;
 #define _WCTYPE_T_DEFINED
 #endif
+
+#ifndef _ERRNO_T_DEFINED
+typedef int errno_t;
+#define _ERRNO_T_DEFINED
+#endif