gcc: Drop testsuite failure fix patch

This patch has headers as if it were submitted upstream but I can't find any
record of it. I did try tests with it removed, building the referenced testsuite
files with -Werror and it all works just fine with no warnings or errors (tested
on MACHINE=qemux86). I suspect this was fixed in gcc itself in other ways.

As such I think this patch isn't needed and suggest we drop it. If there is
a reason it is needed, please report along with an example of how to reproduce
issues.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>