When $<TARGET_PROPERTY> names a build property like COMPILE_DEFINITIONS
but not the usage requirement (INTERFACE_) version of it, the value
should be that used to build the target. It should not be influenced by
a dependent 'head' target like usage requirements are.
Extend the CompileDefinitions test with a case covering the corrected
behavior.
Reviewed-by: Stephen Kelly <steveire@gmail.com>
Brad King