Log Message:
diffstat: update to 1.62.

2018/08/15 (diffstat 1.62)
	+ improve checks for unmodified files when -S and -D options are
	  given.

	+ improve test-packages, to check warning-options.

	+ minor fixes for manpage (Debian #895963)

	+ update configure macros

	+ update config.guess, config.sub

	+ minor fixes for prefix-stripping with -S option.