Merge pull request #22159 from Rostepher/fix-overlay-apinotes

[Build System: CMake] Set the binary dir for the bundled apinotes to the source dir when building the standalone overlays.

Author: najacque

cmake/modules/StandaloneOverlay.cmake

@@ -62,7 +62,7 @@ precondition(TOOLCHAIN_DIR)
 # Some overlays include the runtime's headers,
 # and some of those headers are generated at build time.
 add_subdirectory("${SWIFT_SOURCE_DIR}/include" "${SWIFT_SOURCE_DIR}/include")
-add_subdirectory("${SWIFT_SOURCE_DIR}/apinotes" "swift/apinotes")
+add_subdirectory("${SWIFT_SOURCE_DIR}/apinotes" "${SWIFT_SOURCE_DIR}/apinotes")
 
 # Without this line, installing components is broken. This needs refactoring.
 swift_configure_components()