allow leon and leon[3-9] as CPU names to designate sparc-leon

[Olivier Hainque]

Hello,

At least gcc supports specific configurations for the leon families of sparc
processors. These are expected to be designated as 'sparc-leon*' canonical
targets, where the 'leon' specialization is stated in lieu of the vendor name.

This patch is something we have been using to allow configuring with
the leon cpu name upfront, e.g. --target=leon-elf to designate sparc-leon-elf.

It passes the config.sub previous & new tests.

Is this OK to commit ?

Thanks in advance for your feedback,

With Kind Regards,

Olivier

2014-09-18  Olivier Hainque  <address@hidden>

        * config.sub (leon, leon[3-9]): New CPUs.
        * testsuite/config-sub.data: New tests for leon & leon3.

leon-config.diff
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