gdm-pam-extensions: Install gdm-custom-json-pam-extension.h header
In MR !227 (merged) the meson.build
file wasn't updated, which led to
gdm-custom-json-pam-extension.h
not being installed. This will
cause build failures if a source file includes gdm-pam-extensions.h
,
as is the case with sssd (see Ubuntu's FTBFS log
here.
This will need to be backported to Debian/Ubuntu.
Cc @3v1n0