configure: check for sqlite3_expanded_sql (SQLite3 version 3.14, 2016-08-08)

Our Travis, for example, doesn't have 3.14.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

configure

@@ -186,6 +186,20 @@ int main(void)
 	return 0;
 }
 /*END*/
+var=HAVE_SQLITE3_EXPANDED_SQL
+desc=sqlite3_expanded_sql
+style=DEFINES_EVERYTHING|EXECUTE|MAY_NOT_COMPILE
+link=-lsqlite3
+code=
+#include <sqlite3.h>
+#include <stdio.h>
+
+int main(void)
+{
+	printf("%p\n", sqlite3_expanded_sql);
+	return 0;
+}
+/*END*/
 EOF
 mv $CONFIG_VAR_FILE.$$ $CONFIG_VAR_FILE