stdio: use __REDIRECT for fwrite, fwrite_unlocked * lib/stdio.in.h (fwrite): When working around bug 11959, use __REDIRECT rather than '#define fwrite(...) ... fwrite (...) ...'. This is a more-targeted way to fix the -Wunused-value issue with clang, and it works with GCC too. Problem with targeting reported by Eric Blake in <http://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00067.html>. (fwrite_unlocked): Treat like fwrite. I ran into this issue while debugging the fwrite issue.

# Suppress a valgrind message about use of uninitialized memory in memchr().
# POSIX states that when the character is found, memchr must not read extra
# bytes in an overestimated length (for example, where memchr is used to
# implement strnlen).  However, we use a safe word read to provide a speedup.
{
    memchr-value4
    Memcheck:Value4
    fun:rpl_memchr
}
{
    memchr-value8
    Memcheck:Value8
    fun:rpl_memchr
}