[PATCH] Add/enable Alpha detection

[PATCH] Add/enable Alpha detection

- uncomment the Alpha detection defining Q_PROCESSOR_ALPHA, which is
  already used/documented in few places
- set the right machine type in QElfParser for Alpha ELF files

Pick-to: 6.5
Change-Id: I072bdee8b73ad3c86591c764aa7075c114967fd9
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>
Gbp-Pq: Name upstream_Add-enable-Alpha-detection.patch