Added check for duplicate ordinals, and fixed bug it uncovered in

dlls/msnet32/msnet32.spec

@@ -54,7 +54,6 @@
  54 stub @
  55 stub @
  56 stub @
- 57 stub @
  57 stdcall @(long long ptr long ptr) MSNET32_57
  58 stub @
  59 stub @

tools/winebuild/parser.c

@@ -517,6 +517,11 @@ static int ParseOrdinal(int ordinal)
         if (ordinal > Limit) Limit = ordinal;
         if (ordinal < Base) Base = ordinal;
         odp->ordinal = ordinal;
+        if (Ordinals[ordinal])
+        {
+            error( "Duplicate ordinal %d\n", ordinal );
+            goto error;
+        }
         Ordinals[ordinal] = odp;
     }