indicate tag type in C

Mark the tag type (struct) for the _Unwind_Exception in C code.  This silences a
warning from clang about missing struct specifier.

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@228356 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed