Log Message:
Update to 3.47.1

Changelog:
NSS 3.47.1 includes:

* CVE-2019-11745 - EncryptUpdate should use maxout, not block size
* Bug 1590495 - Fix a crash that could be caused by client certificates during
startup
* Bug 1589810 - Fix compile-time warnings from uninitialized variables in a
perl script

NSS 3.47.1 requires NSPR 4.23 or newer. The HG tag is NSS_3_47_1_RTM.