restore "do {" mistakenly taken out in SUBSUBTARGET_OVERRIDE_OPTIONS for ppc-vxworks

[Olivier Hainque]

This fixes a glitch introduced by me with rev 187581.
Committing as obvious.

2012-07-01  Olivier Hainque  <hainque@adacore.com>

	* config/rs6000/vxworks.h (SUBSUBTARGET_OVERRIDE_OPTIONS): Restore
	the "do {" part of the do-while(0) loop.

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