Auto-sync with upstream branch master
    
    Upstream commit: 38b52865d4ccfee3647f27e969e539a4396a73b1
    
    - Drop glibc-rh1670028.patch, applied upstream
    
    - elf: Add DF_1_KMOD, DF_1_WEAKFILTER, DF_1_NOCOMMON to <elf.h>
    - resolv: Enable full ICMP errors for UDP DNS sockets [BZ #24047]
    - C-SKY: add elf header definition for elfutils
    - C-SKY: mark lr as undefined to stop unwinding
    - C-SKY: remove user_regs definition
    - C-SKY: fix sigcontext miss match
    - Bug 24307: Update to Unicode 12.0.0
    - Break lines before not after operators, batch 4.
    - check-wrapper-headers test: Adjust Fortran include file directory
    - Fix location where math-vector-fortran.h is installed.