Remove cxa demangle cmake check

Simon Praetoriusrequested to merge
feature/remove-cxa-demangle-checks into master

Summary

Remove cxa demangle cmake check, replaced by simple __has_include preprocessor check

Details

If the header <cxxabi.h> is available, the macro HAVE_CXA_DEMANGLE is defined. Instead of have a cmake test, just test für this header in the code.

Edited by Simon Praetorius

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