Update OpenMPI to v4.1.6

This release is a bug fix release.
See https://www.mail-archive.com/announce@lists.open-mpi.org/msg159.html
for the list of fixes and other changes.

openmpi.spec

@@ -1,4 +1,4 @@
-### RPM external openmpi 4.1.5
+### RPM external openmpi 4.1.6
 ## INITENV SET OPAL_PREFIX %{i}
 Source: https://download.open-mpi.org/release/open-mpi/v4.1/%{n}-%{realversion}.tar.bz2
 BuildRequires: autotools