Rationalise -O2 vs -OC library build.

src/runtime/MathL.Mod

@@ -131,7 +131,7 @@ PROCEDURE fraction*(x: LONGREAL): LONGREAL;
    significant) part of `x'.  Hence the following relationship shall
    hold: x = scale(fraction(x), exponent(x)).
 *)
-  VAR s: SET;
+  VAR s: SYSTEM.SET64;
 BEGIN
   IF x = ZERO THEN RETURN ZERO
   ELSE
@@ -170,7 +170,7 @@ PROCEDURE scale*(x: LONGREAL; n: INTEGER): LONGREAL;
   The value of the call scale(x,n) shall be the value x*radix^n if such
   a value exists; otherwise an execption shall occur and may be raised.
 *)
-  VAR exp: LONGINT; lexp: SYSTEM.SET64;
+  VAR exp: HUGEINT; lexp: SYSTEM.SET64;
 BEGIN
   IF x = ZERO THEN RETURN ZERO END;
   exp := exponent(x) + n;                           (* new exponent *)

src/runtime/Out.Mod

@@ -199,4 +199,5 @@ PROCEDURE LongReal*(x: LONGREAL; n: INTEGER);
 BEGIN RealP(x, n, TRUE);
 END LongReal;
 
+BEGIN in := 0
 END Out.

src/runtime/vt100.Mod

@@ -1,4 +1,4 @@
-MODULE vt100;
+MODULE VT100;
 
 IMPORT Out, Strings;
  (* reference http://en.wikipedia.org/wiki/ANSI_escape_code
@@ -339,4 +339,4 @@ CONST
       Strings.Append("hello", tmpstr);
       Out.String(tmpstr); Out.Ln;
 *)
-   END vt100.
+   END VT100.