Log Message:
x11/qt5ct: update to 1.7

Version 1.7
* added keywords entry to desktop file (Mateusz Łukasik)
* changed minimal Qt version to 5.15 for cmake build system
* fixed qmake build

Version 1.6
* added XDG desktop portal dialogs support (Marco Genasci)
* added qt6ct compatibility
* improved warning about incorrect environment variable
* improved icon loader
* only prepend our stylesheet if it has changed (Carlo Teubner)
* changed minimal required Qt version from 5.4 to 5.9
* fixed compatibility with applications that use own stylesheet (John Lindgren)
* fixed some clazy and clang-tidy warnings
* changed font configuration format
* updated Bulgarian translation (Kiril Kirilov)
* updated Catalan translation (Toni Estévez)
* updated Chinese (Traditional) translation (s8321414)
* updated Czech translation (fri)
* updated Dutch translation (Heimen Stoffels)
* updated Greek translation (Dimitrios Glentadakis)
* updated Japanese translation (UTUMI Hirosi)
* updated Polish translation (Marek Adamski)
* updated Russian translation (Ilya Kotov)
* updated Spanish translation (Toni Estévez)
* updated Ukrainian translation (Denys Nykula)