Fix Ubuntu compilation problem

indra/llaudio/CMakeLists.txt

@@ -50,6 +50,11 @@ if (FMOD)
          audioengine_fmod.h
          listener_fmod.h
          )
+
+    if (LINUX AND ${GXX_VERSION} MATCHES "4.[23]")
+        set_source_files_properties(audioengine_fmod.cpp
+                                    COMPILE_FLAGS -Wno-error=write-strings)
+    endif (LINUX AND ${GXX_VERSION} MATCHES "4.[23]")
 endif (FMOD)
 
 set_source_files_properties(${llaudio_HEADER_FILES}