packages: improve dependency check in virtual packages.

packages: improve dependency check in virtual packages.

The current version of dependency check for virtual package <foo>
defines FOO_CONFIGURE_CMDS to print an error message if the
dependencies are not met.

This patch updates all the virtual packages to use the GNU Make control
function $(error text...) instead.

This makes the error happen at the beginning of the build, with a clearer
message.

Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>