fix: add missing #include <system_error> for std::errc (#511)

JohelEGP · web-flow · commit 214257e1d597 · 2023-06-13T17:52:05.000-07:00
diff --git a/include/cpp2util.h b/include/cpp2util.h
@@ -217,6 +217,7 @@
     #include <compare>
     #include <iterator>
     #include <concepts>
+    #include <system_error>
 
     #ifndef CPP2_NO_EXCEPTIONS
         #include <exception>
