Auto-sync with upstream branch master
    
    Upstream commit: b99b0f93ee8762fe53ff65802deb6f00700b9924
    
    - nss: Use "files dns" as the default for the hosts database (#2033020)
    - arm: Guard ucontext _rtld_global_ro access by SHARED, not PIC macro
    - Fix The GNU ToolChain Authors copyright notice
    - Remove upper limit on tunable MALLOC_MMAP_THRESHOLD
    - localedata: add new locale ab_GE
    - Fix __minimal_malloc segfaults in __mmap due to stack-protector
    - __glibc_unsafe_len: Fix comment
    - malloc: Enable huge page support on main arena
    - malloc: Move MORECORE fallback mmap to sysmalloc_mmap_fallback
    - malloc: Add Huge Page support to arenas
    - malloc: Add Huge Page support for mmap
    - malloc: Move mmap logic to its own function
    - malloc: Add THP/madvise support for sbrk
    - malloc: Add madvise support for Transparent Huge Pages
    - powerpc: Use global register variable in <thread_pointer.h>
    - Use LFS and 64 bit time for installed programs (swbz#15333)