added H2.Wide.

did some makefile experiments

h2/lib/h2-wide.ads

@@ -0,0 +1,9 @@
+with H2.Scheme;
+with H2.Utf8;
+
+package H2.Wide is
+
+	package Scheme is new H2.Scheme (Standard.Wide_Character);
+	package Utf8 is new H2.Utf8 (Standard.Character, Standard.Wide_Character);
+
+end H2.Wide;