We need to handle CMAKE_INCLUDE_CURRENT_DIR for include directories.
Otherwise generated files located in the current binary directory are
not found as expected.
e.g. *.json file as meta data for Qt5's plugins generated at build time.
Change-Id: I14ae1e7013f9d8b485aa990d50db4a03ca4f4b81
Reviewed-by: Yuchen Deng <loaden@gmail.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
