Remove unnecessary comparison operators between abc::str_base_ and C const *
Remove unnecessary comparison operators between abc::str_base_ and C const *

Not used in the code base, where C const [size] is used instead.

This is mainly to help MSC16 decide between C const * and C const [size]
overloads:

   abc/str.hxx(602): could be 'bool operator !=<C,TTraits>(const abc::str_base_<C,TTraits> &,const C *)'
   abc/str.hxx(602): or       'bool operator !=<C,TTraits,0x07>(const abc::str_base_<C,TTraits> &,const C (&)[7])'
   while trying to match the argument list '(abc::dmstr, const wchar_t [7])'

raffaellod/lofty,raffaellod/lofty