Build fix

indra/llaudio/CMakeLists.txt

@@ -51,10 +51,12 @@ if (FMOD)
          listener_fmod.h
          )
 
-    if (LINUX AND ${GXX_VERSION} MATCHES "4.[23]")
+    if (LINUX)
+      if (${GXX_VERSION} MATCHES "4.[23]")
         set_source_files_properties(audioengine_fmod.cpp
                                     COMPILE_FLAGS -Wno-error=write-strings)
-    endif (LINUX AND ${GXX_VERSION} MATCHES "4.[23]")
+      endif (${GXX_VERSION} MATCHES "4.[23]")
+    endif (LINUX)
 endif (FMOD)
 
 set_source_files_properties(${llaudio_HEADER_FILES}