Switch to upstream 2.38 release
    
    Upstream commit: 4ca186e931348a7b4518e8103e89602bc8e6f496
    
    - <sys/platform/x86.h>: Add APX support
    - translations: update cs, nl, vi
    - string: Fix tester build with fortify enable with gcc 6
    - linux: Fix i686 with gcc6
    - i386: Remove memset_chk-nonshared.S
    - i386: Fix build with --enable-fortify=3
    - posix: Fix test-errno build with fortify enable
    - powerpc: Fix powerpc64 strchrnul build with old gcc
    - sunrpc: Fix netname build with older gcc
    - malloc: Fix set-freeres.c with gcc 6
    - nscd: cleanup obsolete _FORTIFY_SOURCE setting