Temporarily disable SwiftReflectionTest library builds

Some Mach APIs don't appear to resolve on iOS.

Author: bitjammer

stdlib/private/CMakeLists.txt

@@ -12,7 +12,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
     add_subdirectory(StdlibUnittestFoundationExtras)
     add_subdirectory(SwiftPrivateLibcExtras)
     add_subdirectory(SwiftPrivatePthreadExtras)
-    add_subdirectory(SwiftReflectionTest)
+    # add_subdirectory(SwiftReflectionTest)
   endif()
 endif()