Fix vorbis linkage on linux

indra/cmake/Audio.cmake

@@ -10,6 +10,7 @@ if (USESYSTEMLIBS)
 else (USESYSTEMLIBS)
   use_prebuilt_binary(ogg_vorbis)
   set(VORBIS_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include)
+  set(VORBISENC_INCLUDE_DIRS ${VORBIS_INCLUDE_DIRS})
   set(VORBISFILE_INCLUDE_DIRS ${VORBIS_INCLUDE_DIRS})
 
   if (WINDOWS)
@@ -25,12 +26,14 @@ else (USESYSTEMLIBS)
   else (WINDOWS)
     set(OGG_LIBRARIES ogg)
     set(VORBIS_LIBRARIES vorbis)
+    set(VORBISENC_LIBRARIES vorbisenc)
     set(VORBISFILE_LIBRARIES vorbisfile)
   endif (WINDOWS)
 endif (USESYSTEMLIBS)
 
 link_directories(
     ${VORBIS_LIBRARY_DIRS}
+    ${VORBISENC_INCLUDE_DIRS}
     ${VORBISFILE_LIBRARY_DIRS}
     ${OGG_LIBRARY_DIRS}
     )

indra/cmake/LLAudio.cmake

@@ -7,4 +7,4 @@ set(LLAUDIO_INCLUDE_DIRS
     )
 
 # be exhaustive here
-set(LLAUDIO_LIBRARIES llaudio ${VORBISFILE_LIBRARIES} ${VORBIS_LIBRARIES} ${OGG_LIBRARIES} ${OPENAL_LIBRARIES})
+set(LLAUDIO_LIBRARIES llaudio ${VORBISENC_LIBRARIES} ${VORBISFILE_LIBRARIES} ${VORBIS_LIBRARIES} ${OGG_LIBRARIES} ${OPENAL_LIBRARIES})

indra/llaudio/CMakeLists.txt

@@ -18,6 +18,7 @@ include_directories(
     ${LLMESSAGE_INCLUDE_DIRS}
     ${LLVFS_INCLUDE_DIRS}
     ${OGG_INCLUDE_DIRS}
+    ${VORBISENC_INCLUDE_DIRS}
     ${VORBISFILE_INCLUDE_DIRS}
     ${VORBIS_INCLUDE_DIRS}
     ${OPENAL_LIB_INCLUDE_DIRS}
@@ -87,6 +88,7 @@ target_link_libraries(
     ${LLMATH_LIBRARIES}
     ${LLMESSAGE_LIBRARIES}
     ${LLVFS_LIBRARIES}
+    ${VORBISENC_LIBRARIES}
     ${VORBISFILE_LIBRARIES}
     ${VORBIS_LIBRARIES}
     ${OGG_LIBRARIES}