Dennis: disable qwt on macos

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@5790 383ad7c9-94d9-4d36-a494-682f7c89f535

CMakeLists.txt

 include(plugin)
 
+if (NOT APPLE)
   find_package(Qwt5)
+endif ()
 
-if(Qwt5_Qt4_FOUND)
+if(NOT APPLE AND Qwt5_Qt4_FOUND)
   add_definitions(-DWITH_QWT)
   MESSAGE(STATUS, "include path: ${Qwt5_INCLUDE_DIR}")
   openflipper_plugin(INCDIRS ${Qwt5_INCLUDE_DIR} LIBRARIES ${Qwt5_Qt4_LIBRARY})