Add Licenses to funC stdlib

crypto/smartcont/mathlib.fc

@@ -4,6 +4,21 @@
  -
  -}
 
+{-
+    This file is part of TON FunC Standard Library.
+
+    FunC Standard Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    FunC Standard Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+-}
+
 #include "stdlib.fc";
 #pragma version >=0.4.2;