dvb-apps: fix static only build

This commit makes dvb-apps behave properly in a static-only build. It
passes the static=1 variable to the Makefile, and adds a patch that
fixes the Makefile to not build .so libraries when static=1.

Fixes:

  http://autobuild.buildroot.org/results/3db/3dbfa7b692d4b123b3ba6b55c84df12818273554/



[Peter: drop V=1 as pointed out by Yann]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>