patch 9.0.0349: filetype of *.sil files not well detected

Problem:    Filetype of *.sil files not well detected.
Solution:   Inspect the file contents to guess the filetype.
diff --git a/src/version.c b/src/version.c
index 18278c3..f885aa1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    349,
+/**/
     348,
 /**/
     347,