Auto-sync with upstream branch master
    
    Upstream commit: f6c8204fd7fabf0cf4162eaf10ccf23258e4d10e
    
    - elf: Do not run constructors for proxy objects
    - x86_64: Add log1p with FMA
    - Remove references to the defunct db2 subdir
    - string: Fix tester build with fortify enable with gcc < 12
    - s390x: Fix static PIE condition for toolchain bootstrapping.
    - m68k: fix __mpn_lshift and __mpn_rshift for non-68020
    - sysdeps: tst-bz21269: fix -Wreturn-type
    - Loongarch: Add ifunc support for memcpy{aligned, unaligned, lsx, lasx} and memmove{aligned, unaligned, lsx, lasx}
    - Loongarch: Add ifunc support for strchr{aligned, lsx, lasx} and strchrnul{aligned, lsx, lasx}
    - sysdeps: tst-bz21269: handle ENOSYS & skip appropriately
    - sysdeps: tst-bz21269: fix test parameter
    - hurd: Fix strictness of <mach/thread_state.h>
    - hurd: Add prototype for and thus fix _hurdsig_abort_rpcs call
    - io/tst-statvfs: fix statfs().f_type comparison test on some arches
    - fxprintf: Get rid of alloca