patch 9.0.2179: no filetype detection for execline scripts

Problem:  no filetype detection for execline scripts
Solution: Add filetype detection for execline

as a prior to adding syntax support for execline (see
https://github.com/djpohly/vim-execline/issues/2), i went ahead and made
the filetype detection for execline scripts.

closes: #13689

Signed-Off-By: Mazunki Hoksaas <rolferen@gmail.com>
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index f51cd71..fe22069 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -236,6 +236,7 @@
     esqlc: ['file.ec', 'file.EC'],
     esterel: ['file.strl'],
     eterm: ['anyEterm/file.cfg', 'Eterm/file.cfg', 'some-Eterm/file.cfg'],
+    execline: ['/etc/s6-rc/run', './s6-rc/src/dbus-srv/up', '/sbin/s6-shutdown'],
     exim: ['exim.conf'],
     expect: ['file.exp'],
     exports: ['exports'],
@@ -915,6 +916,7 @@
             ['#!/path/itclsh'],
             ['#!/path/itkwish']],
     expect: [['#!/path/expect']],
+    execline: [['#!/sbin/execlineb -S0'], ['#!/usr/bin/execlineb']],
     gnuplot: [['#!/path/gnuplot']],
     make:   [['#!/path/make']],
     nix:    [['#!/path/nix-shell']],
@@ -970,6 +972,7 @@
     perl: [['#!/usr/bin/env VAR=val perl']],
     scala: [['#!/usr/bin/env VAR=val VVAR=vval scala']],
     awk: [['#!/usr/bin/env VAR=val -i awk']],
+    execline: [['#!/usr/bin/env execlineb']],
     scheme: [['#!/usr/bin/env VAR=val --ignore-environment scheme']],
     python: [['#!/usr/bin/env VAR=val -S python -w -T']],
     wml: [['#!/usr/bin/env VAR=val --split-string wml']],
diff --git a/src/version.c b/src/version.c
index 498c346..89b224e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2179,
+/**/
     2178,
 /**/
     2177,