build: adjust for new build layout

Moving CoreFoundation into the root is needed to actually get the proper
dependency tracking for Foundation builds. This adjusts the use of it
in XCTest.

Author: compnerd

CMakeLists.txt

@@ -106,6 +106,7 @@ add_swift_library(XCTest
                     -Xcc -fblocks
 
                     -I${XCTEST_PATH_TO_FOUNDATION_BUILD}/swift
+                    -Fsystem ${XCTEST_PATH_TO_FOUNDATION_BUILD}
                     -Fsystem ${XCTEST_PATH_TO_COREFOUNDATION_BUILD}/System/Library/Frameworks
 
                     # compatibility with Foundation build_script.py

Tests/Functional/lit.cfg

@@ -85,6 +85,8 @@ else:
         '-L', foundation_dir,
         '-I', foundation_dir,
         '-I', os.path.join(foundation_dir, 'swift'),
+        '-Xcc', '-F', '-Xcc', foundation_dir,
+
         '-I', core_foundation_dir,
         '-Xcc', '-F', '-Xcc', os.path.join(core_foundation_dir, 'System', 'Library', 'Frameworks'),
     ])