Compiler: Fix enum field size was not taken into account when implicitly passed to a function.

Imported from Pawn 3.3.3930.

Example:

---

enum tag
{
  member[32]
}

new var[tag];

foo(const string[], size = sizeof(string))
{
    // size returns 1 before fix, 32, after.
}

public plugin_init()
{
    foo(var[member]);
}

---

compiler/libpc300/sc3.c

@@ -2047,7 +2047,7 @@ static int nesting=0;
                   error(47);      /* array sizes must match */
               } /* if */
             } /* if */
-            if (lval.ident!=iARRAYCELL) {
+            if (lval.ident!=iARRAYCELL|| lval.constval>0) {
               /* save array size, for default values with uSIZEOF flag */
               cell array_sz=lval.constval;
               assert(array_sz!=0);/* literal array must have a size */