Revision 503940

Update security/olm to latest upstream release.

Source has moved to gitlab, still under Matrix.org. Release notes at
	https://gitlab.matrix.org/matrix-org/olm/releases
major changes were in 3.1.0 already, Short Authentication String
and public key signing. Various compatibility and build fixes
were also applied.

Also PORTREVISION dependent ports (that I know about). No MFH because
these are feature-based releases, not security updates.

PR:		238384
Submitted by:	Alexander Sieg
Reported by:	Alexander Sieg