unifyfs: add patch to fix #15292 (#15315)

It was reported that UnifyFS had a bug with the --enable-mpi-mount
config option, which corresponds to the auto-mount variant. This bug
was fixed in the UnifyFS dev branch, however remains broken for the
0.9.0 version.

This adds a patch to the unifyfs package to fix the auto-mount
variant when installing with version 0.9.0.

This also removes the openssl dependency as unifyfs does not directly
depend on it. This was said to be a non-explicit dependency in #15258.
However, if it is needed, it is likely a non-explicit dependency of
one of unifyfs's dependencies and should be added there.

Fixes: #15292