Closes#2101
At the same time fix dependencies so it can be built without a local
X server, and a comment is shown if C++ support isn't enabled.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Many packages used to depend on BR2_PACKAGE_XORG||BR2_PACKAGE_XORG7,
but this is useless since BR2_PACKAGE_XORG is a non-existing
configuration option. So, these depencies gets simplified to
BR2_PACKAGE_XORG7 only.
Some others were depending on BR2_PACKAGE_TINYX (which doesn't) exist
or BR2_PACKAGE_XSERVER_xorg || BR2_PACKAGE_XSERVER_tiny ||
BR2_PACKAGE_XSERVER_x11r7. Replace all that mess by a simple
dependency on BR2_PACKAGE_XORG7.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
