CMake: Dependency variable for FUSIONSOUND_SHARED was wrong (thanks, Kaleb!).

Fixes Bugzilla #2055.

CMakeLists.txt

@@ -243,7 +243,7 @@ set_option(DUMMYAUDIO          "Support the dummy audio driver" ON)
 set_option(VIDEO_DIRECTFB      "Use DirectFB video driver" OFF)
 dep_option(DIRECTFB_SHARED     "Dynamically load directfb support" ON "VIDEO_DIRECTFB" OFF)
 set_option(FUSIONSOUND         "Use FusionSound audio driver" OFF)
-dep_option(FUSIONSOUND_SHARED  "Dynamically load fusionsound audio support" ON "FUSIONSOUND_SHARED" OFF)
+dep_option(FUSIONSOUND_SHARED  "Dynamically load fusionsound audio support" ON "FUSIONSOUND" OFF)
 set_option(VIDEO_DUMMY         "Use dummy video driver" ON)
 set_option(VIDEO_OPENGL        "Include OpenGL support" ON)
 set_option(VIDEO_OPENGLES      "Include OpenGL ES support" ON)