Auto-sync with upstream branch master
    
    Upstream commit: 993e3107af67edefcfc79a62ae55f7b98aa5151e
    
    - Add AArch64 HWCAPs from Linux 5.0
    - tt_RU: Fix orthographic mistakes in day and abday sections [BZ #24296]
    - iconv, localedef: avoid floating point rounding differences [BZ #24372]
    - Fix parentheses error in iconvconfig.c and ld-collate.c [BZ #24372]
    - S390: New configure check and hwcap values for new CPU architecture arch13
    - S390: Add memmove, strstr, and memmem ifunc variants for arch13
    - nptl: Remove pthread_clock_gettime pthread_clock_settime
    - linux: Assume clock_getres CLOCK_{PROCESS,THREAD}_CPUTIME_ID
    - Remove __get_clockfreq
    - Do not use HP_TIMING_NOW for random bits
    - hp-timing: Refactor rtld usage, add generic support
    - Add NT_ARM_PAC_MASK and NT_MIPS_MSA from Linux 5.0 to elf.h
    - Add UDP_GRO from Linux 5.0 to netinet/udp.h
    - nptl: Convert tst-sem5 & tst-sem13 to use libsupport
    - nptl/tst-rwlock14: Test pthread_rwlock_timedwrlock correctly
    - nss/tst-nss-files-alias-leak: add missing opening quote in printf
    - math: Enable some math builtins for clang
    - powerpc: Use __builtin_{mffs,mtfsf}
    - RISC-V: Fix `test' operand error with soft-float ABI being configured