[ANNOUNCE] NSPR 4.23 Release

The NSPR 4.23 release is now available.  The hg tag is
NSPR_4_23_RTM.  The source tar file can be downloaded from
https://ftp.mozilla.org/pub/mozilla.org/nspr/releases/v4.23/src/

NSPR 4.23 contains the following changes:
- fixed a build failure that was introduced in 4.22
- correctness fix for Win64 socket polling
- whitespace in C files was cleaned up and no longer uses
  tab characters for indenting

For details, please refer to the list of related bugs:
https://bugzilla.mozilla.org/buglist.cgi?resolution=FIXED&query_format=advanced&product=NSPR&target_milestone=4.23

Thanks to all contributors to this release.
Kai