babeltrace2: don't install static modules

babeltrace2: don't install static modules

There's no point building or installing static plugins, so apply a patch
to only build shared plugins.

Poky passes --disable-static via no-static-libs.inc, but anyone building
babeltrace2 with nodistro or another distro that doesn't use
no-static-libs.inc will fail to build babeltrace2 because of packaging
errors around the static version of the python plugin.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>