[perl #43246] [CAGE] Replace string_from_const_cstring() with string_from_cstring()

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Per the note in src/string.c around line 509:

        /* XXX This is identical to string_from_cstring and should be removed */
        PARROT_API
        STRING *
        string_from_const_cstring(Interp *interp, 
                const char *buffer /*NULLOK*/, const UINTVAL len)

... replace all uses of string_from_const_cstring() with calls to 
string_from_cstring(), then remove this function.