[konsole] Remove last bits of KDELibs4Support

Review Request #121630 - Created Dec. 22, 2014 and discarded

Information
Christoph Feck
konsole
master
Reviewers
konsole
hindenburg

This remove compilation and linking against KDELibs4Support.

Replaces KGlobalSettings::smallestReadableFont() with QFontDatabase::systemFont().

Also, some minor include changes.

Compiles and still works.

Kurt Hindenburg
Christoph Feck
Review request changed

Status: Discarded

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