Add test for bug #904. Wrong arguments for void sig.
void use empty arguments calls and do not need to handle call_object overhead.
[GH #897] Add declaration of the nci loader function, for the static nci
functions not yet.
--core already has the two loader declarations in include/parrot/nci.h.
omit the duplicate dynext loader declaration, it was moved the the HEADERIZER section.
regenerate the core nci thunk c files,
do not warn on dups on glut_nci, there will be most likely duplicates, core should have none instead.