[patch] use GCC_SUFFIX in more places

[Lillian Angel]

Matthias Klose wrote:
> this adds more places to build with a specific gcc version; by default
> GCC_SUFFIX is unset.
> 
> ok to checkin?

Yes. If GCC_SUFFIX is unset by default, I do not see the harm.


Be sure to commit to the icedtea6 repo, since we are focusing all our 
work there.
Lillian