build: use allowed over enabled

Meson feature options are typically in a tri-state of enabled, disabled,
or auto.  The enabled and disabled functions on an option (from
`get_option`) no longer return true for auto features.  Instead, the
expectation is to use `allowed()` which is true for both enabled and auto.

Switch all uses of `enabled` to `allowed`.

Change-Id: I2fcb7f5ec79e4a71720306519e31d010ba9852ec
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed