Include update to stdio.h missed in r331936.

In my attempt to limit the commit in r331936 to only the gets_s()
commit and not include unrelated patches in my tree, this patch
was missed.

Reported by:	pfg
MFC after:	2 weeks
X-MFC with:	r331936
Differential Revision:	https://reviews.freebsd.org/D12785

1 files changed, 8 insertions, 0 deletions

diff --git a/include/stdio.h b/include/stdio.h
index 68c8dd76a0c2..d6986e154273 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -51,6 +51,11 @@ typedef	__size_t	size_t;
 #define	_SIZE_T_DECLARED
 #endif
 
+#ifndef _RSIZE_T_DEFINED
+#define _RSIZE_T_DEFINED
+typedef size_t rsize_t;
+#endif
+
 #if __POSIX_VISIBLE >= 200809
 #ifndef _OFF_T_DECLARED
 #define	_OFF_T_DECLARED
@@ -265,6 +270,9 @@ size_t	 fwrite(const void * __restrict, size_t, size_t, FILE * __restrict);
 int	 getc(FILE *);
 int	 getchar(void);
 char	*gets(char *);
+#if defined(__EXT1_VISIBLE) && __EXT1_VISIBLE == 1
+char	*gets_s(char *, rsize_t);
+#endif
 void	 perror(const char *);
 int	 printf(const char * __restrict, ...);
 int	 putc(int, FILE *);