v3 PATCH to include/bits/locale_facets.h to revert reordering of virtual functions

[Jason Merrill]

Benjamin's patch of 2011-08-06 (r177542) to clean up doxygen markup 
changed the order of the num_get::do_get virtual functions.  This breaks 
ABI compatibility, so I'm reverting the change.

Tested x86_64-pc-linux-gnu, applied to trunk.
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