repair arguments (add const)

repair arguments (add const)

SCCS-vsn: lib/libc/stdio/fdopen.c 5.5
SCCS-vsn: lib/libc/stdio/fopen.c 5.4
SCCS-vsn: lib/libc/stdio/fputs.c 5.5
SCCS-vsn: lib/libc/stdio/freopen.c 5.5
SCCS-vsn: lib/libc/stdio/fseek.c 5.6
SCCS-vsn: lib/libc/stdio/ftell.c 5.4
SCCS-vsn: lib/libc/stdio/fwrite.c 5.4
SCCS-vsn: lib/libc/stdio/remove.c 5.2
SCCS-vsn: lib/libc/stdio/vsnprintf.c 5.2
SCCS-vsn: lib/libc/stdio/vsprintf.c 5.5
SCCS-vsn: lib/libc/stdio/fsetpos.c 5.2
SCCS-vsn: lib/libc/stdio/funopen.c 5.2