Problem: TI linker files are not recognized
Solution: inspect '*.cmd' files and detect TI linker files
as 'lnk' filetype, include a lnk ftplugin and syntax
script (Wu, Zhenyu)
closes: #16320
Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>