Revert "Fixed deprecated conversion, compiler warning"

This reverts commit d8fa7acaf561228567d2ef4fcd6990020c920eb9.
proper fix for -Wwrite-strings.

string constants need to be cast to const char*, not char* -- still
need to be constant. Compiler allows us to cast them to char*, but
throws a warning, because editing a constant later would exhibit
undefined behavior.