travis: split out matrix from env

With next commits we'll add a couple of more options.

v2: Rework check target.
v3: Comment the current check target, add -j4 SCONSFLAGS
v4: Keep check target as-is, will rework with later patch.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Andres Gomez <agomez@igalia.com>
1 file changed