Auto-sync with upstream branch master
    
    Upstream commit: 69239bd7a216007692470aa9d5f3658024638742
    
    - Drop glibc-disable-werror-tst-realloc.patch, GCC was fixed long ago.
    
    - stdlib: fix grouping verification with multi-byte thousands separator (bug 30964)
    - build-many-glibcs: Check for required system tools
    - x86: Prepare `strrchr-evex` and `strrchr-evex512` for AVX10
    - aarch64: Optimise vecmath logs
    - aarch64: Cosmetic change in SVE exp routines
    - aarch64: Optimize SVE cos & cosf
    - aarch64: Improve vecmath sin routines
    - nss: Get rid of alloca usage in makedb's write_output.
    - debug: Add regression tests for BZ 30932
    - Fix FORTIFY_SOURCE false positive
    - nss: Rearrange and sort Makefile variables
    - inet: Rearrange and sort Makefile variables
    - Fix off-by-one OOB write in iconv/tst-iconv-mt