patch 9.1.0234: filetype: support for Intel HEX files is lacking

Problem:  filetype: support for Intel HEX files is lacking
Solution: Add more file extensions that are typical for Intel HEX files
          (Wu, Zhenyu)

Reference: https://en.wikipedia.org/wiki/Intel_HEX

closes: #14355

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index d77e5e0..881fab2 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -312,7 +312,7 @@
     hcl: ['file.hcl'],
     heex: ['file.heex'],
     hercules: ['file.vc', 'file.ev', 'file.sum', 'file.errsum'],
-    hex: ['file.hex', 'file.h32'],
+    hex: ['file.hex', 'file.ihex', 'file.ihe', 'file.ihx', 'file.int', 'file.mcs', 'file.h32', 'file.h80', 'file.h86', 'file.a43', 'file.a90'],
     hgcommit: ['hg-editor-file.txt'],
     hjson: ['file.hjson'],
     hlsplaylist: ['file.m3u', 'file.m3u8'],
diff --git a/src/version.c b/src/version.c
index 1f748c8..a5395e9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    234,
+/**/
     233,
 /**/
     232,