arg.c: add a missing include

barracuda156 · barracuda156 · commit 39c657215683 · 2025-04-05T14:46:07.000+08:00
diff --git a/common/arg.cpp b/common/arg.cpp
@@ -18,6 +18,7 @@
 #include <algorithm>
 #include <climits>
 #include <cstdarg>
+#include <filesystem>
 #include <fstream>
 #include <regex>
 #include <set>
