Make simulator sound functional again in OS X (and probably Linux)

The radio/src/simu/CMakeLists.txt was missing the SDL defines/includes required for SDL audio

radio/src/targets/simu/CMakeLists.txt

@@ -7,6 +7,12 @@ set(SIMU_SRC ${SIMU_SRC} simpgmspace.cpp)
 add_definitions(-DSIMU)
 remove_definitions(-DCLI)
 
+if(SDL_FOUND)
+  include_directories(${SDL_INCLUDE_DIR})
+  add_definitions(-DSIMU_AUDIO)
+  add_definitions(-DJOYSTICKS)
+endif()
+
 if(Qt5Widgets_FOUND)
   set(SIMULATOR_FLAVOUR opentx-${FLAVOUR})
   set(SIMULATOR_TARGET ${SIMULATOR_FLAVOUR}-simulator)
@@ -14,6 +20,7 @@ if(Qt5Widgets_FOUND)
   include_directories(${COMPANION_SRC_DIRECTORY} ${COMPANION_SRC_DIRECTORY}/simulation)
   add_library(${SIMULATOR_TARGET} SHARED ${SIMU_SRC} opentxsimulator.cpp)
   add_dependencies(${SIMULATOR_TARGET} ${FIRMWARE_DEPENDENCIES})
+  target_link_libraries(${SIMULATOR_TARGET} ${SDL_LIBRARY})
   qt5_use_modules(${SIMULATOR_TARGET} Core)
   add_custom_target(libsimulator DEPENDS ${SIMULATOR_TARGET})
 endif()
@@ -30,7 +37,7 @@ if(NOT WIN32)
   add_executable(simu WIN32 ${SIMU_SRC} ../../simu.cpp)
   add_dependencies(simu ${FIRMWARE_DEPENDENCIES})
   target_include_directories(simu PUBLIC /usr/local/include/fox-1.6 PUBLIC /usr/include/fox-1.6 /opt/local/include/fox-1.6)
-  target_link_libraries(simu FOX-1.6 pthread)
+  target_link_libraries(simu FOX-1.6 pthread ${SDL_LIBRARY})
 endif()
 
 if(APPLE)