add porthole tests to meson

tests/meson.build

@@ -1 +1,18 @@
-subdir('fuzz')
+tests = {}
+
+subdir('porthole')
+
+foreach test, test_args : tests
+    name = fs.name(test)
+
+    test(
+        f'test_@name@',
+        executable(
+            f'test_@name@',
+            test,
+            dependencies: [mon, itertools],
+            link_with: [gentoo_utils],
+        ),
+        args: test_args,
+    )
+endforeach