Auto-sync with upstream branch origin/master
    
    Upstream commit: 6b86036452b9ac47b4ee7789a50f2f37df7ecc4f
    
    - CVE-2017-15804: glob: Fix buffer overflow during GLOB_TILDE unescaping
    - powerpc: Use latest string function optimization for internal function calls
    - math: No _Float128 support for ppc64le -mlong-double-64 (swbz#22402)
    - tpi_PG locale: Fix wrong d_fmt
    - aarch64: Disable lazy symbol binding of TLSDESC
    - tpi_PG locale: fix syntax error (swbz#22382)
    - i586: Use conditional branches in strcpy.S (swbz#22353)
    - ffsl, ffsll: Declare under __USE_MISC, not just __USE_GNU
    - csb_PL locale: Fix abmon/mon for March (swbz#19485)
    - locale: Various yesstr/nostr/yesexpr/noexpr fixes (swbz#15260, swbz#15261)
    - localedef: Add --no-warnings/--warnings option
    - powerpc: Replace lxvd2x/stxvd2x with lvx/stvx in P7's memcpy/memmove
    - locale: Use ASCII as much as possible in LC_MESSAGES
    - Add new locale yuw_PG (swbz#20952)
    - malloc: Add single-threaded path to malloc/realloc/calloc/memalloc
    - i386: Replace assembly versions of e_powf with generic e_powf.c
    - i386: Replace assembly versions of e_log2f with generic e_log2f.c
    - x86-64: Add powf with FMA
    - x86-64: Add logf with FMA
    - i386: Replace assembly versions of e_logf with generic e_logf.c
    - i386: Replace assembly versions of e_exp2f with generic e_exp2f.c
    - x86-64: Add exp2f with FMA
    - i386: Replace assembly versions of e_expf with generic e_expf.c