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Fix build errors and modernise specs

Mostly importing latest changes from Fedora and using gem_install macro
to ensure specs build using standard settings under newer Ruby packages.

Update dependencies to ror SCL

Replace ruby(abi) with ruby(release) in SCL-only specs

Automatic commit of package [rubygem-pg] minor release [0.12.2-9.fm1_10].

Converted spec files

Import SCL dependencies