CONFIGURE_COMPONENTS globs components/* and components/test/* and adds every
directory it finds, so the test-only components are built even when the build
is configured with -DWITH_UNIT_TESTS=OFF. Most of that is some fifty
translation units compiled and then discarded, but two of the six also install
a binary: mysql_test_event_tracking and mysql_keyring_encryption_test, neither
of which a server installation has any use for. Neither is claimed by a
mysql_select slot, so dropping them does not disturb `port select`.

Follow WITH_UNIT_TESTS. Note that components/test has to be dropped from the
first glob as well as the second: components/* matches the directory itself,
whose CMakeLists.txt declares the components, while components/test/* matches
the subdirectories beneath it.

--- a/cmake/component.cmake
+++ b/cmake/component.cmake
@@ -146,7 +146,12 @@
 # Add all CMake projects under components
 MACRO(CONFIGURE_COMPONENTS)
   FILE(GLOB dirs_components ${CMAKE_SOURCE_DIR}/components/*)
-  FILE(GLOB dirs_components_test ${CMAKE_SOURCE_DIR}/components/test/*)
+  IF(WITH_UNIT_TESTS)
+    FILE(GLOB dirs_components_test ${CMAKE_SOURCE_DIR}/components/test/*)
+  ELSE()
+    LIST(REMOVE_ITEM dirs_components ${CMAKE_SOURCE_DIR}/components/test)
+    SET(dirs_components_test)
+  ENDIF()
   FOREACH(dir ${dirs_components} ${dirs_components_test})
     IF (EXISTS ${dir}/CMakeLists.txt)
       ADD_SUBDIRECTORY(${dir})