recipes-security/softhsm: Softhsm Patch

Softhsm2 seems to be rarely maintained these days and has a bug that
leads to segfaults when running through Openssl library destructors. Set
the SRC_URI to the current development version as the last "release" is
from 2020. Add the Patch from [1] until this is fixed upstream.

[1] softhsm/SoftHSMv2#742

Signed-off-by: Johannes Wiesboeck <johannes.wiesboeck@aisec.fraunhofer.de>

Author: jwsbck