Add foundation_classes as a link library for class_adapter.

TextShape::BoundingBox(Point&, Point&) in TextShape.cpp from the
class_adapter library uses the Point class, so we must have a library
dependency on the foundation_classes library.

Structural_Patterns/Adapter/class_adapter/CMakeLists.txt

@@ -1,4 +1,4 @@
 add_library(class_adapter SHARED TextShape.cpp)
 
 target_include_directories(class_adapter PRIVATE .. ../../../Foundation_Classes)
-target_link_libraries(class_adapter PRIVATE adapter)
+target_link_libraries(class_adapter PRIVATE adapter foundation_classes)