Add integration tests for inofity limits

inotify exposes a /proc interface to limit kernel memory usage. If those
limits are set too low, inotify cannot add all watches. The integration
test verifies, that Inotify yields an error in that case.

Package.swift

@@ -36,7 +36,10 @@ let package = Package(
 		),
 		.testTarget(
 			name: "InotifyIntegrationTests",
-			dependencies: ["Inotify"],
+			dependencies: [
+				"Inotify",
+				.product(name: "SystemPackage", package: "swift-system")
+			],
 		),
 		.executableTarget(
 			name: "TaskCLI",