Turn off warning for partial variadic functions. Turn warning for arg…

[stevelinton]

… not in last place into error.

This is intended to be merged in the first non-beta release of 4.8

[olexandr-konovalov]

Thanks! The failure of the Travis check is reported because it expects the warning

Syntax warning: New syntax used -- intentional? in stream line 2
t := Runtimes().user_time + Runtimes().system_time;
^

in timeout.tst. If you will not update the PR before, I will update the test file when this will be merged.

[fingolfin]

I guess PR #391 kind of makes this obsolete?

[markuspf]

This is obsoleted by #391