updated for version 7.3.291

Problem:    Configure doesn't work properly with Python3.
Solution:   Put -ldl before $LDFLAGS. Add PY3_NO_RTLD_GLOBAL. (Roland
            Puntaier)

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    291,
 /**/
     290,
 /**/