user can provide init_script_pre.sh and init_script_post.sh containing
some commands to influence the build

e.g.
$ cat init_script_pre.sh
USE_POHIC=1

Patch pending on Jerome's approval before merging in the TASTE VM

Sync functions need to know their calling threads when they call RIs.
This is not obtained via a POHIC interface
(POHIC only)

Opengeode RI use a prefix RI<sep>RIname to avoid compilation name
clashes. However legacy TASTE systems using Ada are not expecting it.
Both must be supported.