Install of the cef binaries is missing in CMakeLists

[L-Trump]

This cause problems on packaging. After installing by the PKGBUILD in my ArchLinux. Following error occurs:

> linux-wallpaperengine
linux-wallpaperengine: error while loading shared libraries: libcef.so: cannot open shared object file: No such file or directory

After packaging, only few files are involved:

> pacman -Ql linux-wallpaperengine-git
linux-wallpaperengine-git /usr/
linux-wallpaperengine-git /usr/bin/
linux-wallpaperengine-git /usr/bin/linux-wallpaperengine
linux-wallpaperengine-git /usr/share/
linux-wallpaperengine-git /usr/share/linux-wallpaperengine/
linux-wallpaperengine-git /usr/share/linux-wallpaperengine/patches/
linux-wallpaperengine-git /usr/share/linux-wallpaperengine/patches/lens_flare_sun.frag.json
linux-wallpaperengine-git /usr/share/linux-wallpaperengine/patches/vhstest.vert.json
linux-wallpaperengine-git /usr/share/linux-wallpaperengine/patches/water_caustics.frag.json

Maybe it's better to use a system-wide cef dependency?