#i122208# use rtl::CStringHash and rtl::CStringEqual instead of relying on pre-tr1-stl specializations

In stlport<=4 the functors hash and equal_to had specializions for conveniently handling c-strings.
For consistency reasons this specialization was not included in the TR1 report and the C++11 standard.
The two new helper functors are drop-in replacements for the old specializations.