[RFR]: Add alpha detection to platform.m4

[John Paul Adrian Glaubitz]

Hi!

The attached patch adds alpha as a detected platform to platform.m4
in the same manner s390(x) was added in revision 786.

Please note that afterwards, generated_configure.sh needs to be
updated so that it matches the definitions in platform.m4. So, my
sponsor should take care of this. See the diff for revision 786
for details.

Thanks,
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913
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