Fixed TIFFImageReader compilation for GCC 4.2 on OS X.
Fixed TIFFImageReader compilation for GCC 4.2 on OS X.

Converting string constants to char * is deprecated - so we must use const char *.

goddardl/cortex,lento/cortex,lento/cortex,hradec/cortex,appleseedhq/cortex,hradec/cortex,goddardl/cortex,appleseedhq/cortex,lento/cortex,appleseedhq/cortex,goddardl/cortex,hradec/cortex