gnome.bbclass: Add --disable-scrollkeeper to EXTRA_OECONF
gnome.bbclass: Add --disable-scrollkeeper to EXTRA_OECONF

Virtually all gnome recipes pass this already, this just fixes
a few such as zenity.

Signed-off-by: Tom Rini <4c3d5c8f8c21c27dd329bd585f481113514551fd@mentor.com>

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