Remove unneeded QT definitions
- QT_USE_FAST_OPERATOR_PLUS is subset of set QT_USE_QSTRINGBUILDER
- QT_USE_FAST_CONCATENATION got dropped pre-Qt5
Copied from https://commits.kde.org/calligra/697cf600d511f236c15971c0d15f0645951cde26
rempt | Jun 30 2018, 2:36 PM |