[CMake] Remove unused dependency on Foundation build directory

Author: finagolfin

Sources/Overlays/_Testing_Foundation/CMakeLists.txt

@@ -20,17 +20,6 @@ add_library(_Testing_Foundation
 target_link_libraries(_Testing_Foundation PUBLIC
   Testing)
 
-# Although this library links Foundation on all platforms, it only does so using
-# `target_link_libraries()` when building for non-Apple platforms. This is
-# because that command uses the `-lFoundation` linker flag, but on Apple
-# platforms Foundation is a .framework and requires a different flag. However,
-# we don't need to explicitly pass any linker flag since it's handled
-# automatically on Apple platforms via auto-linking.
-if(NOT APPLE)
-  target_link_libraries(_Testing_Foundation PUBLIC
-    Foundation)
-endif()
-
 # Note: This does not enable Library Evolution, despite emitting a module
 # interface, because Foundation does not have Library Evolution enabled for all
 # platforms.

Sources/Testing/CMakeLists.txt

@@ -125,8 +125,6 @@ if(NOT APPLE)
     target_link_libraries(Testing PUBLIC
       dispatch)
   endif()
-  target_link_libraries(Testing PUBLIC
-    Foundation)
   if (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
       CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
     target_link_libraries(Testing PUBLIC execinfo)