ENH: convert to work with the new syntax for ADD_SUBDIRECTORY

Tests/OutOfSource/SubDir/CMakeLists.txt

@@ -1,4 +1,3 @@
 PROJECT(ANOTHER_PROJ)
 # subdir to a sibling dir
-ADD_SUBDIRECTORY(OutOfSourceSubdir 
-  ${OutOfSource_SOURCE_DIR}/${KEN}OutOfSourceSubdir)
+ADD_SUBDIRECTORY(${OutOfSource_SOURCE_DIR}/${KEN}OutOfSourceSubdir OutOfSourceSubdir )