v4l2: conditionnaly compile v4l2 test

Author: EmmanuelP

tests/meson.build

@@ -92,9 +92,14 @@ if get_option('tests')
 		['time-test',			'timetest.c'],
 		['load-http-test',		'loadhttptest.c'],
 		['cpp-test',			'cpp.cc'],
-		['v4l2-test',			'v4l2test.c']
 	]
 
+        if v4l2_dep.found()
+          examples += [
+		['v4l2-test',			'v4l2test.c'],
+            ]
+        endif
+
 	if host_machine.system()=='linux'
 		examples+=[['realtime-test','realtimetest.c']] # uses Linux RT API unavailable on other platforms
 	endif