Added -DSQLITE_ENABLE_PERCENTILE=1 compile time option

Author: Willena

Makefile

@@ -136,6 +136,7 @@ $(SQLITE_OUT)/sqlite3.o: $(SQLITE_UNPACKED) $(SQLITE_SOURCE)/sqlite3.c $(SQLITE_
 	-DSQLITE_USER_AUTHENTICATION=0 \
 	-DNDEBUG \
 	-DSQLITE_ENABLE_UPDATE_DELETE_LIMIT=1 \
+	-DSQLITE_ENABLE_PERCENTILE=1 \
 	$(SQLITE_FLAGS) \
 	$(SQLITE_OUT)/sqlite3.c