needed with "make check". Compile other apps with specific target.

	*  CMakeLists.txt,
	*  tests/CMakeLists.txt,
	*  tests/accu/CMakeLists.txt,
	*  tests/colors/CMakeLists.txt,
	*  tests/core/CMakeLists.txt,
	*  tests/draw/CMakeLists.txt,
	*  tests/graph/CMakeLists.txt,
	*  tests/graphcut/CMakeLists.txt,
	*  tests/io/CMakeLists.txt,
	*  tests/labeling/CMakeLists.txt,
	*  tests/morpho/CMakeLists.txt: Fixes.