patch 8.2.3729: no support for squirrels

Problem:    No support for squirrels. (closes #9259)
Solution:   Recognize nuts.

runtime/filetype.vim

@@ -1756,6 +1756,9 @@ au BufNewFile,BufRead *.sqlj			setf sqlj
 " SQR
 au BufNewFile,BufRead *.sqr,*.sqi		setf sqr
 
+" Squirrel
+au BufNewFile,BufRead *.nut			setf squirrel
+
 " OpenSSH configuration
 au BufNewFile,BufRead ssh_config,*/.ssh/config		setf sshconfig
 au BufNewFile,BufRead */etc/ssh/ssh_config.d/*.conf	setf sshconfig

src/testdir/test_filetype.vim

@@ -477,6 +477,7 @@ let s:filename_checks = {
     \ 'sqlj': ['file.sqlj'],
     \ 'sqr': ['file.sqr', 'file.sqi'],
     \ 'squid': ['squid.conf'],
+    \ 'squirrel': ['file.nut'],
     \ 'srec': ['file.s19', 'file.s28', 'file.s37', 'file.mot', 'file.srec'],
     \ 'sshconfig': ['ssh_config', '/.ssh/config', '/etc/ssh/ssh_config.d/file.conf', 'any/etc/ssh/ssh_config.d/file.conf', 'any/.ssh/config'],
     \ 'sshdconfig': ['sshd_config', '/etc/ssh/sshd_config.d/file.conf', 'any/etc/ssh/sshd_config.d/file.conf'],

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3729,
 /**/
     3728,
 /**/