MFH: r370066

- Update slib and slib-guile to 3b4
- Fix build for lang/slib with new texinfo [1]
- Convert slib-guile @exec/@unexec directives to post install/deinstall scripts
- Add new port slib-guile2 based on slib-guile
- Remove dirrms

Approved by:	ports-secteam (rea)
Make sysutils/pstree operable in jailed environment.

(cherry picked from commit 0aa00da618ffa2bc5b4c4f8b89be22b9df2e9936)
(cherry picked from commit 47d35918828bb4b20951316d178cd6d6c410f9c6)
Revert "Define and use "our_gid" variable."

(cherry picked from commit dac485f7aa680ee457f67add02b2d1416956e531)
Startup script now supports multiple profiles.

(cherry picked from commit bc186548d5f9d1b53d58e9abc5e39f7d916dba91)
(cherry picked from commit f7276b8fda49456743b97046b9f8ed6fb22cc8e2)