Auto-sync with upstream branch release/2.30/master
    
    Upstream commit: d59630f9959b0bb8991964758ab854ff4378b20d
    
    - arm: CVE-2020-6096: Fix multiarch memcpy for negative length [BZ #25620]
    - arm: CVE-2020-6096: fix memcpy and memmove for negative length [BZ #25620]
    - NEWS: Mention BZ 25933 fix
    - Fix avx2 strncmp offset compare condition check [BZ #25933]
    - nss_compat: internal_end*ent may clobber errno, hiding ERANGE [BZ #25976]
    - NEWS: Merge two bug lists in the glibc 2.30.1 section
    - NEWS: Mention fixes for BZ 25810/25896/25902/25966
    - x86-64: Use RDX_LP on __x86_shared_non_temporal_threshold [BZ #25966]
    - Add a C wrapper for prctl [BZ #25896]
    - powerpc: Rename argN to _argN in LOADARGS_N [BZ #25902]
    - Add C wrappers for process_vm_readv/process_vm_writev [BZ #25810]
    - Mark unsigned long arguments with U in more syscalls [BZ #25810]
    - Add a syscall test for [BZ #25810]
    - Add SYSCALL_ULONG_ARG_[12] to pass long to syscall [BZ #25810]
    - x32: Properly pass long to syscall [BZ #25810]
    - Add new file missed in previous hppa commit.
    - Fix data race in setting function descriptors during lazy binding on hppa.
    - stdlib: Move tst-system to tests-container
    - support/shell-container.c: Add builtin kill
    - support/shell-container.c: Add builtin exit
    - support/shell-container.c: Return 127 if execve fails
    - Add NEWS entry for CVE-2020-1751 (bug 25423)
    - posix: Fix system error return value [BZ #25715]
    - sparc: Move sigreturn stub to assembly
    - arm: Fix softp-fp Implies (BZ #25635)
    - i386: Use comdat instead of .gnu.linkonce for i386 setup pic register (BZ #20543)
    - Add NEWS entry for CVE-2020-1752 (bug 25414)