patch 9.0.1618: Trace32 files are not recognized

Problem:    Trace32 files are not recognized.
Solution:   Add patterns for the t32 filetype. (Christoph Sax, closes #12505)

src/testdir/test_filetype.vim

@@ -662,6 +662,7 @@ def s:GetFilenameChecks(): dict<list<string>>
               'any/etc/systemd/system/file.d/.#-file',
               'any/etc/systemd/system/file.d/file.conf'],
     systemverilog: ['file.sv', 'file.svh'],
+    t32: ['file.cmm', 'file.t32'],
     tags: ['tags'],
     tak: ['file.tak'],
     tal: ['file.tal'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1618,
 /**/
     1617,
 /**/