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="Remy Bohmer"

reporter_url="linux@bohmer.net"

reporter_comment="Example for building a toolchain for m68000 bare metal targets"