cmake HAVE_GSL_GSL examples

mixxxdj/mixxx CMakeLists.txt :4797 

check_include_file_cxx(gsl/gsl HAVE_GSL_GSL)

mixxxdj/mixxx CMakeLists.txt :4799 

unset(HAVE_GSL_GSL CACHE)

mixxxdj/mixxx src/rendergraph/opengl/CMakeLists.txt :40 

check_include_file_cxx(gsl/gsl HAVE_GSL_GSL)

mixxxdj/mixxx src/rendergraph/opengl/CMakeLists.txt :42 

unset(HAVE_GSL_GSL CACHE)

mixxxdj/mixxx src/rendergraph/scenegraph/CMakeLists.txt :35 

check_include_file_cxx(gsl/gsl HAVE_GSL_GSL)

mixxxdj/mixxx src/rendergraph/scenegraph/CMakeLists.txt :37 

unset(HAVE_GSL_GSL CACHE)