Added to vendor.yml the following dependencies related to automake and autoconf:
- (^|/)configure
- (^|/)configure.ac
- (^|/)config.guess
- (^|/)config.sub

Before changing:
[herbert@vps11071 linguist]$ bundle exec linguist ../atmi++/
75%  Shell
15%  C++
10%  C
0%   Perl

After changing:
54%  C++
37%  C
9%   Shell
0%   Perl
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/github/linguist
Merge pull request #312 from HerbertKoelman/master

Added to vendor.yml dependencies related to automake and autoconf