tree b2d7b9f521e700fcc01fab3c974a56c148730482
parent b1aa8a4773da5fb4e0d4ee9b7fd224ed9bdbba31
author Brad King <brad.king@kitware.com> 1507732341 -0400
committer Brad King <brad.king@kitware.com> 1507735143 -0400

FindXMLRPC: Tolerate no include directories

`xmlrpc-c-config $modules --cflags` may report no `-I` flags if the
headers are in a standard location like `/usr/include`.  In this case
it is okay for `XMLRPC_INCLUDE_DIRS` to be empty.

Ideally the `--cflags` output should be used as hints for a `find_path`
call to really find the headers as we do for other find modules, but
simply assuming no explicit include directories are needed is good
enough for now.

Fixes: #17347