Release 2.2.4 21th August 2021

This release fix some minor build issues brought by last release. All coverity spotted issues has been fixed.

Fixes

• build: stop looping when sbindir = bindir
• build: don’t inherit LTO flags from net-snmp-config –cflags-only-other
• build: use realpath where available to work out relative path for genhash
• build: fix some compile errors on RHEL 7
• build: fix building with OpenSSL prior to v1.1.0
• coverity: fix all spotted issues