MANTIS: 1191. unused find_package calls

SuperBuild/CMake/External_curl.cmake

SuperBuild/CMake/External_expat.cmake

SuperBuild/CMake/External_freetype.cmake

SuperBuild/CMake/External_geotiff.cmake

SuperBuild/CMake/External_glew.cmake

SuperBuild/CMake/External_itk.cmake

SuperBuild/CMake/External_jpeg.cmake

SuperBuild/CMake/External_libkml.cmake

SuperBuild/CMake/External_libsvm.cmake

SuperBuild/CMake/External_muparser.cmake

SuperBuild/CMake/External_muparserx.cmake

SuperBuild/CMake/External_opencv.cmake

SuperBuild/CMake/External_openjpeg.cmake

SuperBuild/CMake/External_openssl.cmake

SuperBuild/CMake/External_openthreads.cmake

SuperBuild/CMake/External_ossim.cmake

SuperBuild/CMake/External_png.cmake

SuperBuild/CMake/External_qt4.cmake

SuperBuild/CMake/External_tiff.cmake

SuperBuild/CMake/External_tinyxml.cmake