vim-tiny doesn't work well with git commit editing comments

[Wei Tsui]

1) Ubuntu 18.04;
2) remove nano, vim-runtime (full version);
3) install vim-tiny;
4) git a git-repo and do some changes, then press 'git commit -a';
5) vim-tiny will always report many errors as follows:

Error detected while processing /usr/share/vim/vim80/debian.vim:
line 29:
E319: Sorry, the command is not available in this version: function! <SID>MapExists(name, modes)
line 30:
E319: Sorry, the command is not available in this version: for mode in split(a:modes, '\zs')
line 34:
E319: Sorry, the command is not available in this version: endfor
line 35:
E319: Sorry, the command is not available in this version: return 0
line 36:
E319: Sorry, the command is not available in this version: endfunction
Press ENTER or type command to continue

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: vim-tiny 2:8.0.1401-1ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CurrentDesktop: MATE
Date: Wed Mar 7 23:21:55 2018
SourcePackage: vim
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.vim.vimrc.tiny: 2018-03-07T23:21:15.792000

[Wei Tsui (ghostplant)]

vim-tiny should skip some syntax from /usr/share/vim/vim80/debian.vim that is not supported.