build-script: adjust the path for the new layout

Merging the CoreFoundation build into the Foundation build results in
the build tree layout to change.  Adjust the parameters for that to
allow a migration.

Author: compnerd

utils/build-script-impl

@@ -3102,6 +3102,7 @@ for host in "${ALL_HOSTS[@]}"; do
                     # This assumes that there are no spaces in any on these paths.
                     FOUNDATION_BUILD_DIR=$(build_directory ${host} foundation)
                     DOTEST_EXTRA="-I${FOUNDATION_BUILD_DIR}"
+                    DOTEST_EXTRA="-Xcc -F${FOUNDATION_BUILD_DIR}"
                     DOTEST_EXTRA="-Xcc -F${FOUNDATION_BUILD_DIR}/CoreFoundation-prefix/System/Library/Frameworks"
                     DOTEST_EXTRA="${DOTEST_EXTRA} -I${FOUNDATION_BUILD_DIR}/swift"
                     DOTEST_EXTRA="${DOTEST_EXTRA} -I${LIBDISPATCH_SOURCE_DIR}"