Auto-sync with upstream branch master
    
    Upstream commit: 63b4baa44e8d22501c433c4093aa3310f91b6aa2
    
    - Use make -O to serialize make output
    - sysconf: Fix missing definition of UIO_MAXIOV on Linux (#1504165)
    - Install correct bits/long-double.h for MIPS64 (swbz#22322)
    - malloc: Fix deadlock in _int_free consistency check
    - x86-64: Don't set GLRO(dl_platform) to NULL (swbz#22299)
    - math: Add _Float128 function aliases
    - locale: Add new locale mjw_IN (swbz#13994)
    - aarch64: Rewrite elf_machine_load_address using _DYNAMIC symbol
    - powerpc: fix check-before-set in SET_RESTORE_ROUND
    - locale: Use U+202F as thousands separators in pl_PL locale (swbz#16777)
    - math: Use __f128 to define FLT128_* constants in include/float.h for old GCC
    - malloc: Improve malloc initialization sequence (swbz#22159)
    - malloc: Use relaxed atomics for malloc have_fastchunks
    - locale: New locale ca_ES@valencia (swbz#2522)
    - math: Let signbit use the builtin in C++ mode with gcc < 6.x (swbz#22296)
    - locale: Place monetary symbol in el_GR, el_CY after the amount (swbz#22019)