a minor fix to make my life easier

Tests/Simple/CMakeLists.txt

@@ -1,5 +1,5 @@
 # a simple test case
 PROJECT (simple)
-ADD_EXECUTABLE (simple simple)
+ADD_EXECUTABLE (simple simple.cxx)
 ADD_LIBRARY(simpleLib STATIC simpleLib.cxx)
 TARGET_LINK_LIBRARIES(simple simpleLib)