build: update RPM spec to use Qt5 on more Red Hat platforms
build: update RPM spec to use Qt5 on more Red Hat platforms

Resolves Red Hat BZ #1628472.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp