[OpenBIOS] build warnings on gcc6

[Segher Boessenkool]

On Sun, Mar 06, 2016 at 05:10:15PM +0000, Mark Cave-Ayland wrote:
> Apart from the -Wnonnull-compare warning in strdup (which I can only
> assume figures that const char * pointers are non-null), these warnings
> do appear to be valid.

It seems to be <http://gcc/gnu/org/PR69835> (and many duplicates), which
already was fixed on Feb 16.


Segher