lib scripts: add "(GNU Automake)" to --version output, etc.

lib scripts: add "(GNU Automake)" to --version output, etc.

* lib/ar-lib: add "(GNU Automake)" to --version output,
and the "Report bugs" block to --help.
* lib/compile: likewise.
* lib/depcomp: likewise.
* lib/install-sh: likewise.
* lib/mdate-sh: likewise.
* lib/missing: likewise.
* lib/mkinstalldirs: likewise.
* lib/py-compile: likewise.
* lib/tap-driver.sh: likewise.
* lib/test-driver: likewise.
* lib/ylwrap: likewise.
* t/py-compile-usage.sh: update --version pattern.