Signed-off-by: Ted Hess <thess@kitschensync.net>

Package udev does not exist in Lede.
We do not need udev to use package relayctl.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

The license BSD-3-Clause.
Indicate license file.
Use @SF for PKG_SOURCE_URL instead of sourceforge.net URL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Package relayctl provides a command-line tool to control
SainSmart USB relay boards based on FTDI chips using bitbang
mode.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>