* include/wchar.h (putwc): Use libc_hidden_proto.

* include/wchar.h (putwc): Use libc_hidden_proto.

	* include/stdio.h (dprintf, fprintf, vfprintf, sprintf,
	sscanf, fwrite, perror, remove, rewind, open_memstream): Likewise.
	* stdio-common/dprintf.c: Add libc_hidden_def.
	* stdio-common/fprintf.c: Likewise.
	* stdio-common/sprintf.c: Likewise.
	* stdio-common/sscanf.c: Likewise.
	* libio/iofwrite.c: Likewise.
	* libio/memstream.c: Likewise.
	* libio/putwc.c: Likewise.
	* stdio-common/perror.c: Likewise.
	* sysdeps/posix/remove.c: Likewise.
	* sysdeps/generic/remove.c: Likewise.
	* libio/rewind.c: Likewise.  Use <stdio.h> instead of "stdio.h".
	* stdio-common/vfprintf.c: Add libc_hidden_def.  Include <stdio.h>.