libssh: build without server support

Signed-off-by: Stephan Raue <stephan@openelec.tv>
nano: update to nano-2.3.5

Signed-off-by: Stephan Raue <stephan@openelec.tv>
autoconf: add patch to support excluding of autoreconf steps, taken from openembedded

Signed-off-by: Stephan Raue <stephan@openelec.tv>
tvheadend: add patch to remove -Werror from CFLAGS

Signed-off-by: Stephan Raue <stephan@openelec.tv>