patch 9.0.0711: SubStation Alpha files are not recognized

Problem:    SubStation Alpha files are not recognized.
Solution:   Add patterns for SubStation Alpha files. (closes #11332)
diff --git a/src/version.c b/src/version.c
index 2b922f3..d3189fb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    711,
+/**/
     710,
 /**/
     709,