Manager: Drop 'which' package dependency

src/package.cpp

@@ -199,10 +199,9 @@ bool Package::distroDependencies()
 		dependencies.push_back({ "dpkg-query", "dpkg" });
 	}
 
-	// FIXME: Conglomerate which calls to save multiple external process creation.
 	Util::System $;
 	for (const auto& dependency : dependencies) {
-		if ($("which " + dependency.at(0))().status() > 0) {
+		if (!findDependency(dependency.at(0))) {
 			fprintf(stderr, "\033[31;1mPackage:\033[0m required dependency '%s' is missing\n", dependency.at(1).c_str());
 			return false;
 		}