Auto-sync with upstream branch master
    
    Upstream commit: 8d7b6b4cb27d4dec1dd5f7960298c1699275f962
    
    - socket: Use may_alias on sockaddr structs (bug 19622)
    - Use a doubly-linked list for _IO_list_all (bug 27777)
    - powerpc64: Fix by using the configure value $libc_cv_cc_submachine [BZ #31629]
    - aarch64/fpu: Add vector variants of cbrt
    - aarch64/fpu: Add vector variants of hypot
    - Use Linux 6.9 in build-many-glibcs.py
    - localedata: Fix several issues with the set of characters considered 0-width [BZ #31370]
    - math: Add GLIBC_TEST_LIBM_VERBOSE environment variable support.
    - malloc: Improve aligned_alloc and calloc test coverage.
    - Unify output from backtrace_symbols_fd with backtrace_symbols (bug 31730)
    - manual: add dup3
    - Force DT_RPATH for --enable-hardcoded-path-in-tests
    - powerpc: Fix __fesetround_inline_nocheck on POWER9+ (BZ 31682)
    - localedata: add mdf_RU locale
    - elf: Make glibc.rtld.enable_secure ignore alias environment variables
    - elf: Remove glibc.rtld.enable_secure check from parse_tunables_string
    - elf: Only process multiple tunable once (BZ 31686)