arch: remove ia64

ia64 is broken in every gcc/glibc combinations I tested (except for the
existing sample that used very old versions).

Nobody complained on the list about not being able to build recent versions.

So the only way forward I can see is to remove the architecture altogether.

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

 reporter_name="Ioannis E. VENETIS"

 reporter_url="http://sourceware.org/ml/crossgcc/2009-11/msg00109.html"

 reporter_comment=""