contrib/vimrc: override formatting options for more files

	* 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