More minor issues found while building libstdc++-v3 in gcc mainline for FreeBSD (with patch) 3/3

[Benjamin Kosnik]

> 2000-04-24  Loren J. Rittle  <ljrittle@acm.org>
> 
> 	* src/string-inst.cc: Don't try to build specialization based
> 	on wchar_t if _GLIBCPP_USE_WCHAR_T is not defined.

this should not be necessary now. Please let me know if you still have 
problems after Branko's wchar_t config work...

-benjamin