qttools: Make sure package is usable with per recipe sysroot.
qttools: Make sure package is usable with per recipe sysroot.

Don't hardcode path to host binaries in produced cmake files. Use paths
passed to cmake when it's invoked instead.

Signed-off-by: Piotr Tworek <609406ea531e3b5e2c2b904a5a230fe95ba235e2@tworaz.net>

schnitzeltony/meta-qt5-extra,schnitzeltony/meta-qt5-extra,schnitzeltony/meta-qt5-extra