gpg: Use gpg_strerror_r for threadsafety
gpg: Use gpg_strerror_r for threadsafety

These APIs are rather painful...this is why GError exists.

gatispaeglis/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree