[Bug plugins/61176] plugin builds including gimple.h not building

[pageexec at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61176

--- Comment #20 from PaX Team <pageexec at gmail dot com> ---
update for gcc-6: <build_dir>/gcc/params.list is also needed now as it gets
included by params.h.