Log Message:
Update to 4.10.7:

NSPR 4.10.7 has the following bug fixes:
- Bug 836658: VC11+ defaults to SSE2 builds by default. Contributed by
  David Major.
- Bug 979278: TSan: data race nsprpub/pr/src/threads/prtpd.c:103
  PR_NewThreadPrivateIndex.
- Bug 1026129: Replace some manual declarations of MSVC intrinsics with
  #include <intrin.h>. Contributed by Ehsan Akhgari.
- Bug 1026469: Use AC_CHECK_LIB instead of MOZ_CHECK_PTHREADS. Skip
  compiler checks when using MSVC, even when $CC is not literally "cl".
  Contributed by Mike Hommey.
- Bug 1034415: NSPR hardcodes the C compiler to cl on Windows.
  Contributed by Ehsan Akhgari.
- Bug 1042408: Compilation fix for Android > API level 19. Contributed
  by Zach Anderson.
- Bug 1043082: NSPR's build system hardcodes -MD.