system-quote, execute, spawn-pipe: Escape '?' on Windows. * lib/system-quote.c (SHELL_SPECIAL_CHARS, CMD_SPECIAL_CHARS): Add the '?' character. * lib/w32spawn.h (SHELL_SPECIAL_CHARS): Likewise. * tests/test-system-quote-main.c (check_all): Check also strings like "??????????". Reported by Eli Zaretskii <eliz@gnu.org>.

# Suppress valgrind messages in an installed libunistring.

# Suppress a valgrind message about use of uninitialized memory in freea().
# This use is OK because it provides only a speedup.
{
    libunistring_freea
    Memcheck:Cond
    fun:libunistring_freea
}