init gompic

boilerplate, to make gompic work w.https://github.com/hpcugent/easybuild-easyconfigs/pull/477
and the better followup https://github.com/hpcugent/easybuild-easyconfigs/pull/545

not final yet, needs more work and a design decision (rely on gcccuda or, not?)

Signed-off-by: Fotis Georgatos <fotis.georgatos@uni.lu>