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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