patch 9.1.0972: filetype: TI linker map files are not recognized

Problem:  filetype: TI linker map files are not recognized
Solution: detect TI linker map files as lnkmap filetype
          (Wu, Zhenyu)

References:
https://downloads.ti.com/docs/esd/SPRUI03A/Content/SPRUI03A_HTML/linker_description.html

closes: #16324

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 f449d0d..0f05d19 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -463,7 +463,6 @@
     mallard: ['file.page'],
     man: ['file.man'],
     manconf: ['/etc/man.conf', 'man.config', 'any/etc/man.conf'],
-    map: ['file.map'],
     maple: ['file.mv', 'file.mpl', 'file.mws'],
     markdown: ['file.markdown', 'file.mdown', 'file.mkd', 'file.mkdn', 'file.mdwn', 'file.md'],
     masm: ['file.masm'],
@@ -2774,6 +2773,24 @@
   filetype off
 endfunc
 
+func Test_map_file()
+  filetype on
+
+  " TI linker map file
+  call writefile(['******************************************************************************', '               TMS320C6x Linker Unix v7.4.24                   ', '******************************************************************************'], 'Xfile.map', 'D')
+  split Xfile.map
+  call assert_equal('lnkmap', &filetype)
+  bwipe!
+
+  " TI linker map file
+  call writefile(['MAP', 'NAME "local-demo"', 'END'], 'Xfile.map', 'D')
+  split Xfile.map
+  call assert_equal('map', &filetype)
+  bwipe!
+
+  filetype off
+endfunc
+
 func Test_org_file()
   filetype on
 
diff --git a/src/version.c b/src/version.c
index b1ce2cc..18a736c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    972,
+/**/
     971,
 /**/
     970,