Ideally we should use "option(host_build)", but that seems
complicated. In addition, some toolchains don't include libQt5Svg.so,
so we cannot build the tool then anyhow.
* rcc: Use the right binary when invoking manually
Otherwise we could run into the following error:
rcc: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/rcc': No such file or directory
Makefile:626: recipe for target 'rcc/qrc_images.cpp' failed
make: *** [rcc/qrc_images.cpp] Error 1
* README: add automotive screenshot (fixes#32)