Remove silly unused isfschar function
Remove silly unused isfschar function

Fixes "unused function 'isfschar' [-Wunused-function]". The function
is not in use and looks silly.

OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap