Fix a problem with resolving ORDER BY clauses that feature COLLATE clauses attached to compound SELECT statements.

FossilOrigin-Name: 427b50fba7362e5b447e79d39050f25ed2ef10af
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 3841c91..1c0ad44 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2389,6 +2389,7 @@
 #define SF_MaybeConvert    0x0400  /* Need convertCompoundSelectToSubquery() */
 #define SF_Recursive       0x0800  /* The recursive part of a recursive CTE */
 #define SF_MinMaxAgg       0x1000  /* Aggregate containing min() or max() */
+#define SF_Converted       0x2000  /* By convertCompoundSelectToSubquery() */
 
 
 /*