Introduced a new make target `snapshotconfig'.
This target is quite equal to the well-known `allmodconfig',
with the extension that all possible target devices are selected
at the same time. This leads to also enabling packages which depend
on certain target devices, what is useful for snapshot builds.
git-svn-id: svn://www.freewrt.org/trunk/freewrt@1232 afb5a338-a214-0410-bd46-81f09a774fd1