Merge tag 'v1.2.3'

* tag 'v1.2.3': (33 commits)
  release 1.2.3
  accept null pointer as message argument to gettext functions
  fix invalid free of duplocale object when malloc has been replaced
  fix __WORDSIZE on x32 sys/user.h
  sys/ptrace.h: add PTRACE_GET_RSEQ_CONFIGURATION from linux v5.13
  sys/prctl.h: add PR_PAC_{SET,GET}_ENABLED_KEYS from linux v5.13
  elf.h: add NT_ARM_PAC_ENABLED_KEYS from linux v5.13
  netinet/in.h: add INADDR_DUMMY from linux v5.13
  bits/syscall.h: add landlock syscalls from linux v5.13
  netinet/tcp.h: add tcp_zerocopy_receive fields from linux v5.12
  netinet/tcp.h: add TCP_NLA_* values up to linux v5.12
  s390x: add ptrace requests from linux v5.12
  bits/syscall.h: add mount_setattr from linux v5.12
  signal.h: add new sa_flags from linux v5.11
  signal.h: add SYS_USER_DISPATCH si_code value from linux v5.11
  signal.h: add si_code values for SIGSYS
  netinet/tcp.h: add tcp zerocopy related changes from linux v5.11
  netinet/if_ether.h: add ETH_P_CFM from linux v5.11
  sys/socket.h: add new SO_ socket options from linux v5.11
  sys/prctl.h: add PR_SET_SYSCALL_USER_DISPATCH from linux v5.11

Test: m USE_HOST_MUSL=true
Bug: 216192129
Change-Id: Ib82c32f83cf0a5f491523d3c4f5b0e74e0700b09