Currently this script doesn't set the indentation style for the standard
library headers under libstdc++/ because they lack a file extension.
But they do have a modeline, so the file type is still set appropriately
by Vim. So by inspecting &filetype, we can also detect these standard
library headers as C-like files.
contrib/ChangeLog:
* vimrc (SetStyle): Also inspect &filetype to determine whether
a file is C-like.
* vim-gcc-dev/syntax/gcc-match.vim: Do not override 'tabstop' here.
* vimrc: Set preferred values for 'tabstop', 'softtabstop',
'shiftwidth', 'noexpandtab', 'textwidth', 'formatoptions' for all
files, not just C-like files.
From-SVN: r275316
