Add an empty cstdlib.elna source file

source/common.elna

@@ -0,0 +1,13 @@
+(* This Source Code Form is subject to the terms of the Mozilla Public License,
+  v. 2.0. If a copy of the MPL was not distributed with this file, You can
+  obtain one at https://mozilla.org/MPL/2.0/. *)
+module;
+
+type
+  Identifier = [256]Char;
+  TextLocation* = record
+    line: Word;
+    column: Word
+  end;
+
+end.