Fixed typo in CMake option name

See merge request !609

cmake/GaudiBuildFlags.cmake

@@ -115,7 +115,7 @@ option(GAUDI_SLOW_DEBUG
        "turn off all optimizations in debug builds"
        ${GAUDI_SLOW_DEBUG_DEFAULT})
 
-option(GAUDI_DIAGNOTICS_COLOR "enable colors in compiler diagnostics" OFF)
+option(GAUDI_DIAGNOSTICS_COLOR "enable colors in compiler diagnostics" OFF)
 
 # set optimization flags (_opt_level_* and _opt_ext_*)
 # - default optimization levels
@@ -399,7 +399,7 @@ else()
   endif()
 endif()
 
-if(GAUDI_DIAGNOTICS_COLOR)
+if(GAUDI_DIAGNOSTICS_COLOR)
   foreach(_language CXX C Fortran)
     set(CMAKE_${_language}_FLAGS "${CMAKE_${_language}_FLAGS} -fdiagnostics-color")
   endforeach()