cmake GMTL examples

OSVR/OSVR-Core cmake/FindSonix12.cmake :124 

find_package(GMTL ${_FIND_FLAGS})

supertuxkart/stk-code lib/wiiuse/cmake/FindSonix12.cmake :124 

find_package(GMTL ${_FIND_FLAGS})

shawwn/noh cmake/FindSonix12.cmake :125 

find_package(GMTL ${_FIND_FLAGS})