added support for 64 bit linux in FindTIXI.cmake
added support for 64 bit linux in FindTIXI.cmake

DLR-SC/tigl,codingpoets/tigl,DLR-SC/tigl,codingpoets/tigl,DLR-SC/tigl,codingpoets/tigl,DLR-SC/tigl,codingpoets/tigl,codingpoets/tigl,codingpoets/tigl,DLR-SC/tigl,DLR-SC/tigl