Merge pull request #2239 from igt-gteubl/csharp-capacity-cs0034

C#: Fix CS0034 in Capacity method of std::vector

Lib/csharp/std_vector.i

@@ -63,7 +63,7 @@
       return (int)capacity();
     }
     set {
-      if (value < size())
+      if (value < 0 || ($typemap(cstype, size_t))value < size())
         throw new global::System.ArgumentOutOfRangeException("Capacity");
       reserve(($typemap(cstype, size_t))value);
     }