Fix CoreFoundation install path

Author: jmschonfeld

Sources/CoreFoundation/CMakeLists.txt

@@ -129,7 +129,7 @@ file(COPY
 install(DIRECTORY
             include/
         DESTINATION
-            lib/swift/CoreFoundation)
+            lib/${SWIFT_SYSTEM_NAME}/CoreFoundation)
 
 if(NOT BUILD_SHARED_LIBS)
     install(TARGETS CoreFoundation