Rename CMake variable USE_SYSTEM_QT5 to USE_SYSTEM_QT
Avoid version number in variable names for CMake configuration. See discussion here: !455 (comment 77762).
Also rename file external_qt5.cmake
->external_qt.cmake
to be consistent.
Avoid version number in variable names for CMake configuration. See discussion here: !455 (comment 77762).
Also rename file external_qt5.cmake
->external_qt.cmake
to be consistent.