[libunwind] remove stray conditional

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@200432 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/mach-o/compact_unwind_encoding.h b/include/mach-o/compact_unwind_encoding.h
index 6110688..bb329a1 100644
--- a/include/mach-o/compact_unwind_encoding.h
+++ b/include/mach-o/compact_unwind_encoding.h
@@ -265,8 +265,6 @@
 //
 
 
-#ifndef __OPEN_SOURCE__
-
 // ARM64
 //
 // 1-bit: start
@@ -333,8 +331,6 @@
 //    function.
 //
 
-#endif // __OPEN_SOURCE__
-