wireshark: Fix new QA Error

NOTE: Resolving any missing task queue dependencies
ERROR: Nothing PROVIDES 'libepoxy' (but /oss/maint/mylayers/openembedded-core/meta/recipes-gnome/gtk+/gtk+3_3.18.8.bb DEPENDS on or otherwise requires it)
ERROR: libepoxy was skipped: missing required distro feature 'opengl' (not in DISTRO_FEATURES)

add DISTRO_FEATURES check for opengl to enable gtk3

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>