Log Message:
Update to 4.10.4

Changelog:
NSPR 4.10.4 has the following bug fixes:
* Bug 767759: Add support for new x32 ABI for NSPR. Contributed by
  Daniel Schepler.
* Bug 844784: TSan: Thread data race in PR_EnterMonitor.
* Bug 936320: Change PR_StringToNetAddr to try pr_StringToNetAddrFB
  first.
* Bug 939786: TSan: data race nsprpub/pr/src/pthreads/ptthread.c:137
  _pt_root.
* Bug 958796: Users of _beginthreadex that set a custom stack size
  may not be getting the behavior they want. Contributed by
  Emanuel Hoogeveen.
* Bug 963033: AArch64 support update for NSPR. Contributed by
  Marcin Juszkiewicz.
* Bug 969061: Incorrect end-of-list test when iterating over a
  PRCList in prcountr.c and prtrace.c
* Bug 971152: IPv6 detection on linux depends on availability of
  /proc/net/if_inet6.
* Bug 972125: Support iOS arm64. Contributed by Sylvain Defresne.