Also, do not set the seed when comparing compilers.

The objective is touse rdbg instead of lurettetop to perform compiler
comparisons. I will plug it later (cf test/site.exp)

Add an option --to-c-dont-inline-predef to get the previous behavior.

(cf 55d3d77c470f416befd16a1b7d47f751eb2171fc)

Some generated intermediary variables where declared as int instead
of bool.  Funnily, ecexe was ok with that...

Also add support to rdbg to perform nonreg test. I do not plug yet it
as it's twice slower. but most of it seems due patch_ecexe. Indeed,
lus2lic -interface compile the whole program just to print the node
interface.

nb: it has detected a couple of existing bugs.