* libc/stdio/freopen.c: Add <string.h> for memset prototype.

* libc/stdio/fseek.c:  Ditto.
	* libc/stdio/fwide.c:  Add <wchar.h> for fwide prototype.

newlib/libc/stdio/freopen.c

@@ -76,6 +76,7 @@ Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
 #include <reent.h>
 #include <time.h>
 #include <stdio.h>
+#include <string.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>