build: remove unnecessary CoreFoundation path passing

Passing these paths around is no longer needed.  Simplify the build
rules.

Author: compnerd

utils/build-script-impl

@@ -2634,8 +2634,6 @@ for host in "${ALL_HOSTS[@]}"; do
 
                     -DXCTEST_PATH_TO_FOUNDATION_BUILD:PATH=${FOUNDATION_BUILD_DIR}
 
-                    -DXCTEST_PATH_TO_COREFOUNDATION_BUILD:PATH=${FOUNDATION_BUILD_DIR}/CoreFoundation-prefix
-
                     -DCMAKE_PREFIX_PATH:PATH=$(build_directory ${host} llvm)
 
                     -DENABLE_TESTING=YES
@@ -3103,7 +3101,6 @@ for host in "${ALL_HOSTS[@]}"; do
                     FOUNDATION_BUILD_DIR=$(build_directory ${host} foundation)
                     DOTEST_EXTRA="-I${FOUNDATION_BUILD_DIR}"
                     DOTEST_EXTRA="${DOTEST_EXTRA} -Xcc -F${FOUNDATION_BUILD_DIR}"
-                    DOTEST_EXTRA="${DOTEST_EXTRA} -Xcc -F${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}"
                     DOTEST_EXTRA="${DOTEST_EXTRA} -L${FOUNDATION_BUILD_DIR}"