Allow building with or without liblo being installed.

liblo is recommended but not a required dependency.
This resolves bug report 948.

src/CMakeLists.txt

@@ -102,7 +102,7 @@ ADD_DEPENDENCIES(rosegardensequencer RosegardenCommon-static)
 
 tde_add_library( RosegardenExtended STATIC AUTOMOC
   SOURCES ${document_SRCS} ${gui_SRCS} ${gui_dcop_SRCS} ${ui_SRCS}
-  LINK dl lo
+  LINK dl ${LIBLO_LIBS}
   DESTINATION ${LIB_INSTALL_DIR}
 )
 
@@ -129,7 +129,7 @@ tde_add_library( RosegardenSegmentCanvas STATIC AUTOMOC
 
 tde_add_executable( rosegarden AUTOMOC
   SOURCES gui/application/main.cpp
-  LINK dl lo tdecore-shared ${LIBLO_LIBS} ${LRDF_LIBS} ${FFTW3F_LIBS} ${XFT_LIBS} ${LIRC_LIBS} ${JACK_LIBS} kio-shared tdeui-shared tdeprint-shared RosegardenExtended RosegardenSegmentCanvas RosegardenCommands RosegardenCommon
+  LINK dl tdecore-shared ${LIBLO_LIBS} ${LRDF_LIBS} ${FFTW3F_LIBS} ${XFT_LIBS} ${LIRC_LIBS} ${JACK_LIBS} kio-shared tdeui-shared tdeprint-shared RosegardenExtended RosegardenSegmentCanvas RosegardenCommands RosegardenCommon
   DESTINATION ${BIN_INSTALL_DIR}
 )
 
@@ -157,7 +157,7 @@ if( WANT_TEST )
 
   tde_add_executable( RosegardenTestDriver AUTOMOC
     SOURCES RosegardenTestDriver.cpp ${tests_SRCS}
-    LINK dl lo tdecore-shared ${LIBLO_LIBS} ${LRDF_LIBS} ${FFTW3F_LIBS} ${XFT_LIBS} ${LIRC_LIBS} ${JACK_LIBS} kio-shared tdeui-shared tdeprint-shared RosegardenExtended RosegardenSegmentCanvas RosegardenCommands RosegardenCommon
+    LINK dl tdecore-shared ${LIBLO_LIBS} ${LRDF_LIBS} ${FFTW3F_LIBS} ${XFT_LIBS} ${LIRC_LIBS} ${JACK_LIBS} kio-shared tdeui-shared tdeprint-shared RosegardenExtended RosegardenSegmentCanvas RosegardenCommands RosegardenCommon
     DESTINATION ${BIN_INSTALL_DIR}
   )