build: Prefer dependencies instead of link_with

Meson uses the 'dependencies' field to determine and
parallelize build steps, but that isn't entirely true
with 'link_with'; this might cause a race condition
when generating header files while trying to build
them.

Fix that by only using 'dependencies' instead of 'link_with'.

cogl/tests/unit/meson.build

@@ -15,8 +15,12 @@ libmutter_cogl_test_unit = executable('test-unit',
     '-DTESTS_DATADIR="@0@/tests/data"'.format(cogl_srcdir),
   ],
   include_directories: cogl_test_unit_includes,
-  dependencies: [cogl_deps, libmutter_cogl_test_fixtures_dep],
-  link_with: [libmutter_cogl, libmutter_cogl_path],
+  dependencies: [
+    cogl_deps,
+    libmutter_cogl_dep,
+    libmutter_cogl_path_dep,
+    libmutter_cogl_test_fixtures_dep,
+  ],
   install: false,
 )