funcall: don't route to generic_fun on optargs.

* lib.c (funcall, funcall1, funcall2, funcall3, funcall4):
Do not go through the generic_funcall slow path just
because the target function has optional arguments.
It's possible that the call is supplying all of the
required arguments. Let's try it like that and then
if it doesn't work and there are optionals, check again
and go the generic_funcall route.  This might not be
an overall improvement by itself, if we end up going
to generic_funcall in more cases than not. However, this
change paves the way for more changes: handling some cases
of optargs in these helpers.

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