libcamera: Enable vimc pipeline handler when tests are enabled

The addition of the new IPA IPC mechanism compiles pipeline-specific
headers to define the interface between the pipeline and the IPA.

This was optimised in 08ce394465 ("meson: ipa, proxy: Only build
proxies for enabled pipelines") to only build for enabled pipelines,
however the tests directly use the VIMC pipeline handler, and require
it to be built.

Create a local variable to store the requested pipelines from the user
configuration and extend the enabled pipelines to ensure that VIMC is
always enabled if the tests are also enabled

Fixes: 08ce394465 ("meson: ipa, proxy: Only build proxies for enabled pipelines")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Sebastian Fricke<sebastian.fricke@posteo.net>

src/ipa/meson.build

@@ -22,7 +22,7 @@ ipa_sign = files('ipa-sign.sh')
 ipas = ['ipu3', 'raspberrypi', 'rkisp1', 'vimc']
 ipa_names = []
 
-foreach pipeline : get_option('pipelines')
+foreach pipeline : pipelines
     if ipas.contains(pipeline)
         subdir(pipeline)
         ipa_names += join_paths(ipa_install_dir, ipa_name + '.so')

src/libcamera/pipeline/meson.build

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: CC0-1.0
 
-foreach pipeline : get_option('pipelines')
+foreach pipeline : pipelines
     subdir(pipeline)
 endforeach