Add missing _LIBCXXABI_FUNC_VIS to __gxx_personality_seh0

This was missed in SVN r337754.

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@339503 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/cxa_personality.cpp b/src/cxa_personality.cpp
index 6759d8a..ec3d981 100644
--- a/src/cxa_personality.cpp
+++ b/src/cxa_personality.cpp
@@ -1038,7 +1038,7 @@
 }
 
 #if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
-extern "C" EXCEPTION_DISPOSITION
+extern "C" _LIBCXXABI_FUNC_VIS EXCEPTION_DISPOSITION
 __gxx_personality_seh0(PEXCEPTION_RECORD ms_exc, void *this_frame,
                        PCONTEXT ms_orig_context, PDISPATCHER_CONTEXT ms_disp)
 {