Fix bug #2333

It wasn't using the "AQUA" theme.

src/CMakeLists.txt

@@ -1231,6 +1231,9 @@ elseif( CMAKE_SYSTEM_NAME MATCHES "Darwin" )
          "-framework CoreAudioKit"
    )
 
+   # Use the Aqua theme
+   set( USE_AQUA_THEME 1 )
+
    # Create the config file
    set( HAVE_VISIBILITY 1 )
    configure_file( audacity_config.h.in private/configmac.h )

src/audacity_config.h.in

@@ -108,3 +108,5 @@
 /* We're using cygwin */
 #cmakedefine __CYGWIN__ 1
 
+/* Use the Aqua theme on Mac */
+#cmakedefine USE_AQUA_THEME 1