The introduction of DISTRO_FEATURES_OPTED_OUT allows rewriting the
DISTRO_FEATURES by removing whatever is in DISTRO_FEATURES_OPTED_OUT
from DISTRO_FEATURES.
Thus, the logic of vala can be negated, and it can changed be to
see if gobject-introspection-data is available in DISTRO_FEATURES.
Signed-off-by: Jose Quaresma <quaresma.jose@gmail.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
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