[PATCH, config.gcc] fix case filter for powerpc-*-vxworkspe

[Olivier Hainque]

To match on vxworks*spe so it applies to VxWorks 7 as well.

Committing to mainline after verifying for e500v2-wrs-vxworks7
that we now include config/powerpcspe/vxworks.h instead of 
config/rs6000/vxworks.h.

Olivier

2017-09-06  Olivier Hainque  <hain...@adacore.com>

        * config.gcc (powerpc-wrs-vxworksspe): Now match as vxworks*spe.

config-vx7spe.diff
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