[v3] Fix for grouped, showbased hex and oct zero

[Paolo Carlini]

Hi,

the below fixes a corner case for num_put::_M_widen_int, which
I have noticed while analyzing libstdc++/7989.

Tested on x86-linux, approved by Benjamin.

Ciao, Paolo.

///////////

2002-09-27  Paolo Carlini  <pcarlini@unitus.it>

      * include/bits/locale_facets.tcc (num_put::_M_widen_int):
      Deal correctly with grouped, showbased (oct or hex) zero.
      * testsuite/22_locale/num_put_members_char.cc: Add test05.
      * testsuite/22_locale/num_put_members_wchar_t.cc: Ditto.


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