fork permissions in Leap 15.3 to a newer version

- Update to version 20200127:
* Makefile: Leap 15.3 still uses /etc, so adjust the installation setup

- Update to version 20181225:
* mgetty: faxq-helper now finally reside in /usr/libexec
* libksysguard5: Updated path for ksgrd_network_helper
* kdesu: Updated path for kdesud
* sbin_dirs cleanup: these binaries have already been moved to /usr/sbin
* mariadb: revert auth_pam_tool to /usr/lib{,64} again
* cleanup: revert virtualbox back to plain /usr/lib
* cleanup: remove deprecated /etc/ssh/sshd_config
* hawk_invoke is not part of newer hawk2 packages anymore
* cleanup: texlive-filesystem: public now resides in libexec
* cleanup: authbind: helper now resides in libexec
* cleanup: polkit: the agent now also resides in libexec
* libexec cleanup: 'inn' news binaries now reside in libexec
* whitelist please (bsc#1183669)
* Fix enlightenment paths
* usbauth: drop compatibility variable for libexec
* usbauth: Updated path for usbauth-npriv
* profiles: finish usage of variable for polkit-agent-helper-1
* Makefile: fix custom flags support when using make command line variables
* added information about know limitations of this approach
* Makefile: compile with LFO support to fix 32-bit emulation on 64-bit hosts (bsc#1178476)
* Makefile: support CXXFLAGS and LDFLAGS override / extension via make/env variables (bsc#1178475)
* profiles: prepare /usr/sbin versions of profile entries (bsc#1029961)
* profiles: use new variables feature to remove redundant entries
* profiles: remove now superfluous squid pinger paths (bsc#1171569)
* tests: implement basic tests for new the new variable feature
* tests: avoid redundant specification of test names by using class names