[Buildroot] [git commit master 1/1] Remove architectures marked as deprecated

[Thomas Petazzoni]

commit: http://git.buildroot.net/buildroot/commit/?id=343f480fe2647febe7fc713722d1131242ba20e3
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master

The Alpha, CRIS, IA64 and Sparc64 architectures have been marked as
deprecated during the previous release cycle. They are not widely used
in embedded systems and/or no longer supported by their manufacturers
and/or not properly supported in Buildroot.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>

Patch is too large, so refusing to show it