patch 8.2.2769: Modula-3 config files are not recognized

Problem:    Modula-3 config files are not recognized.
Solution:   Add filetype patterns. (Doug Kearns)

src/testdir/test_filetype.vim

@@ -290,6 +290,8 @@ let s:filename_checks = {
     \ 'lss': ['file.lss'],
     \ 'lua': ['file.lua', 'file.rockspec', 'file.nse'],
     \ 'lynx': ['lynx.cfg'],
+    \ 'm3build': ['m3makefile', 'm3overrides'],
+    \ 'm3quake': ['file.quake', 'cm3.cfg'],
     \ 'm4': ['file.at'],
     \ 'mail': ['snd.123', '.letter', '.letter.123', '.followup', '.article', '.article.123', 'pico.123', 'mutt-xx-xxx', 'muttng-xx-xxx', 'ae123.txt', 'file.eml', 'reportbug-file'],
     \ 'mailaliases': ['/etc/mail/aliases', '/etc/aliases', 'any/etc/aliases', 'any/etc/mail/aliases'],

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2769,
 /**/
     2768,
 /**/