Security update for gdm

This update for gdm fixes the following issues:

- Exit with failure if loading existing users fails (bsc#1178150 CVE-2020-16125).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Fixed bugs
bnc#1178150
VUL-0: CVE-2020-16125: gdm: Privilege escalation vulnerability in gdm3 (GHSL-2020-202)
Selected Binaries
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