Install gi/ headers again
Install gi/ headers again

libpeas currently requires these; we were installing them before, and
since we export almost all of our internals in for gjs-module.pc, might
as well keep doing these for now.

https://bugzilla.gnome.org/show_bug.cgi?id=655482

pixunil/cjs,magcius/gjs,magcius/gjs,djdeath/gjs,endlessm/gjs,mtwebster/cjs,mtwebster/cjs,pixunil/cjs,endlessm/gjs,endlessm/gjs,magcius/gjs,mtwebster/cjs,djdeath/gjs,djdeath/gjs,endlessm/gjs,pixunil/cjs,magcius/gjs,pixunil/cjs,mtwebster/cjs,endlessm/gjs,djdeath/gjs,mtwebster/cjs,pixunil/cjs,djdeath/gjs,magcius/gjs