meson: test: Simplify top level meson

Utilise the subdir_done() functionality as is used with other optional
components to simplify the top level meson file.

Suggested-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

meson.build

@@ -121,10 +121,7 @@ subdir('src')
 # through configuration values. They are enabled by default.
 
 subdir('Documentation')
-
-if get_option('test')
-    subdir('test')
-endif
+subdir('test')
 
 if not meson.is_cross_build()
     kernel_version_req = '>= 5.0.0'

test/meson.build

@@ -1,5 +1,9 @@
 # SPDX-License-Identifier: CC0-1.0
 
+if not get_option('test')
+    subdir_done()
+endif
+
 subdir('libtest')
 
 subdir('camera')