cc/gcc: fix pr42289: incorrect alignment on OABI

Fix building libffi on OABI.
Although it has been marked as 4.3-only, it is stil not fixed,
and also applies to 4.4.x

See:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42289

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 reporter_name="Julien DUSSER"

 reporter_url="http://sourceware.org/ml/crossgcc/2008-10/msg00054.html"

 reporter_comment="Soft-float for the 405 PowerPC"