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

[jakub at gcc dot gnu.org]

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

--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 35144
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35144&action=edit
gcc5-pr61176.patch

Patch to install all gcc/*.h and gcc/*.def headers, even when they aren't
listed in PLUGIN_HEADERS.