BUG: fix qt5 compilation on ubuntu 18.04
This commit not only includes the bugfix for qt5 on ubuntu but also some improvments in the qt5 external project. The fix concern only the following modification: - add -qt-harfbuzz in the configure script to fix libz conflict Other minor updates: - upgrade qt version to last stable release 5.11.1 - remove commented cmake configuration related to qt4 - add options -optimize-size and -silent options in the configure script to optimize the package see https://blog.qt.io/blog/2017/05/31/qt-lite-qt-5-9-lts/ for detail about the size optimization (contrl compiler flags) silent option reduce the output generated in the build tree. Perhaps not a good idea...
Showing with 22 additions and 81 deletions