If we pass a header to libclang, e.g. because it's open in an editor in
an IDE, warnings about unused const vars are not useful: other files
that include the header might use those constants. So when -x *-header
is passed as command-line option, suppress this warning.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@285386 91177308-0d34-0410-b5e6-96231b3b80d8
Erik Verbruggen