4.20.0-rc3

This should be the last RC before the actual release (expected by next Monday).

Binary tarballs produced and signed with:

$ ./autogen.sh 
$ make dist
$ gpg --detach-sign --armor shadow-4.20.0-rc3.tar.gz 
$ gpg --detach-sign --armor shadow-4.20.0-rc3.tar.xz

Source tarballs produced and signed with:

$ git archive -o shadow-4.20.0-rc3_src.tar 4.20.0-rc3
$ gpg --detach-sign --armor shadow-4.20.0-rc3_src.tar 
$ gzip -nk shadow-4.20.0-rc3_src.tar
$ xz -k shadow-4.20.0-rc3_src.tar