Change unit tests to run as post-build step.

This is how it used to be in most of the old project files. The
CMake conversion required the tests to be run manually after the
build, either by running the binary directly or by calling CTest.
This commit removes the 'dependency' on CTest and restores the
old build process.

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7b2482d..f94881b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,14 +40,10 @@
 
 target_link_libraries(TestUnitTest++ UnitTest++)
 
-# turn on testing
-enable_testing()
-add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} -V)
-
-# add the test runner as a test
-add_test(NAME TestUnitTest++ COMMAND TestUnitTest++ ${CONFIG_PATH} ${CONFIG_TASKS_PATH} ${SOUND_LOG_PATH})
-add_dependencies(check TestUnitTest++)
-
+# run unit tests as post build step
+add_custom_command(TARGET TestUnitTest++
+	POST_BUILD COMMAND TestUnitTest++
+	COMMENT "Running unit tests")
 
 # add install targets
 # need a custom install path?