libgsystem: Update from master

d045e367cc37c774e3d76839b65aaf947b2f65ad is expecting
gs_file_read_noatime to always return an error, but the
commit that did that was never pulled in to gnome-desktop.

Do that now to fix possible crashers with nautilus.

https://bugzilla.gnome.org/show_bug.cgi?id=708435