patch 8.2.2879: file extension .hsig not recognized

Problem:    File extension .hsig not recognized.
Solution:   Use Haskell filetype for .hsig files. (Marcin Szamotulski,
            closes #8236)
diff --git a/src/version.c b/src/version.c
index 0223ae2..796899b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2879,
+/**/
     2878,
 /**/
     2877,