[ANNOUNCE] NSPR 4.27 Release

[Kai Engert]

The NSPR 4.27 release is now available. The hg tag is
NSPR_4_27_RTM. The source tar file can be downloaded from
https://ftp.mozilla.org/pub/mozilla.org/nspr/releases/v4.27/src/

NSPR 4.27 contains the following changes:
- The macOS platform code for shared library loading was
changed to support macOS 11.
If the absolute path parameter given to PR_LoadLibrary
begins with either /System/ or /usr/lib/ then no test is
performed if the library exists at a file.
- An include statement for a Windows system library header
was added

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=4.27

Thanks to all contributors to this release.
Kai