Auto-sync with upstream branch master
    
    Apply glibc-disable-werror-tst-realloc.patch to disable spurious GCC
    warning, and auto-sync with upstream branch master.
    
    Upstream commit: 885d3cda907d0dee54b13cbbf61b040c9951d5a2
    
    - Allow building with --disable-nscd again
    - system: Add "--" after "-c" for sh (BZ #28519)
    - posix: Fix some crashes in wordexp [BZ #18096]
    - LoongArch: ldconfig: Add comments for using EF_LARCH_OBJABI_V1
    - elf: Take into account ${sysconfdir} in elf/tst-ldconfig-p.sh
    - Fix tst-glibc-hwcaps-prepend-cache with custom configure prefix value
    - Fix tst-ldconfig-ld_so_conf-update with custom configure prefix value
    - support: introduce support_sysconfdir_prefix
    - Remove set-hooks.h from generic includes
    - Remove --with-default-link configure option
    - libio: Remove the usage of __libc_IO_vtables
    - libio: Do not autogenerate stdio_lim.h
    - Move libc_freeres_ptrs and libc_subfreeres to hidden/weak functions
    - benchtests: Move libmvec benchtest inputs to benchtests directory
    - stdio-common: tests: don't double-define _FORTIFY_SOURCE
    - LoongArch: ldconfig: Ignore EF_LARCH_OBJABI_V1 in shared objects
    - _dl_map_object_from_fd: Remove unnecessary debugger notification in error path
    - hppa: Drop 16-byte pthread lock alignment
    - Minor: don't call _dl_debug_update (which can have side effects) inside assert
    - x86: Don't check PREFETCHWT1 in tst-cpu-features-cpuinfo.c
    - Declare wcstofN, wcstofNx for C2x
    - Update printf %b/%B C2x support
    - ARC: run child from the separate start block in __clone
    - ARC: Add the clone3 wrapper