[alpha] purge alpha-unicosmk code from the backend

[Richard Henderson]

The bulk of the alpha cray port was removed here:

2008-06-07  Joseph Myers  <joseph@codesourcery.com>

        * config.gcc (Obsolete configurations): Remove list of
        configurations.
        (Unsupported targets list): Add *-*-linux*aout*, *-*-linux*libc1*,
        *-*-solaris2.[0-6], *-*-solaris2.[0-6].*, *-*-sysv*.  Remove other
        targets matched by those patterns.
        (strongarm*-*-*, ep9312*-*-*, xscale-*-*, parisc*-*-*,
        m680[012]0-*-*, *-*-linux*libc1*, *-*-linux*aout*,
        alpha*-*-unicosmk*, strongarm*-*-freebsd*, ep9312-*-elf,

but somehow I spaced on following up on removing the code woven through
the backend.  Tested on alpha-linux, via qemu.


r~
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