first iceadtea cross-compile patch: disable sanity checks

[Matthew Flaschen]

Robert Schuster wrote:
> if (cross-compiling)
>   disable sanity checks by default
> else if (--disable-sanity-checks was given)
>   disable sanity checks
> else
>   do sanity check

I definitely think that's the right approach.  As far as automatically
detecting cross-compiling, I'm not exactly sure either.  I assume you
have seen the cross_compiling variable in configure, but like me don't
know where it comes from.

Matt Flaschen