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* Password dialog is now scaled
* Background of lock screen is now scaled

ignoring return value of ‘fscanf’, declared with attribute warn_unused_result

This commit reverts:

https://github.com/mate-desktop/mate-screensaver/commit/816394c1a6ce9968dba3e1b0ecc884c8ccca4d43

And it applies an alternative to fix the deprecated functions:

gdk_screen_get_width
gdk_screen_get_height

revert 9075047d and update info a bit

fixes https://github.com/mate-desktop/mate-screensaver/issues/94

Fixes #101

OpenBSD does not have nor use pam(8) for password authentication but
instead uses bsd_auth(3): add a bsd_auth authentication scheme to
make locking possible.
This has been a part of gnome-screensaver already but was probably
removed at one point. This is mostly identical to that code, with some
minor modifications.

The function g_get_real_name is used to get user's full name, but when the full
name is not existed, it will return an empty string instead of NULL.

Bug fix: screensaver and lock screen not correctly displayed in configurations with overlapping monitor geometries

Switch to GdkSeat for GTK+ 3.20 and newer

This changes the code quite a lot as both grabbing the pointer and the keyboard
have to be done simultaneously now.

and set grid property only once, after grid is created

Change shake times to even number, so the dialog can return to its original position.

Avoid deprecated gdk_window_set_background functions