Recommended update for postgresql12

This update for postgresql12 fixes the following issues:

- Marked symlinks to pg_config and ecpg as ghost files, so that rpm doesn't complain
when they are not there (bsc#1178961)

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1178961
got a weird warning when removing "postgresql10-devel" package
Selected Binaries
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