Log Message:
diffstat: Update to 1.63

2019/11/29 (diffstat 1.63)
	+ eliminate fixed buffer when decoding range.

	+ use locale in computing filename column-width.

	+ improve parsing for git diffs.

	+ use terminal-width as default for -w to tty.

	+ minor fix in do_merging (Miloslaw Smyk).

	+ improve relative-pathname matching in count_lines()

	+ add a parsing-case for svn diff.

	+ quote filenames in -t/-T output.

	+ fix cppcheck warnings about sscanf.

	+ update configure macros

	+ update config.guess, config.sub