Place the definition of 'va_list' within a preprocessor guard.  This matches the behavior of GCC, and avoids potential conflicts with system headers (e.g., stdio.h).  Fixes <rdar://problem/7727145>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@98003 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed