flot: add plugins missed from 0.8.0 bump

A number of plugins were not added when the flot version was bumped.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
libxml2: depend on zlib and libiconv if appropriate

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
bellagio: needs toolchain with threads support

Fixes:
http://autobuild.buildroot.org/results/a4b/a4b7e19f4eee1de8d8722c2ade673fcb816a811e

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
bellagio: add license information

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Merge remote-tracking branch 'upstream/master'