tests: Use a basic grep that matches the basic regexp style.

Fixes a testsuite failure on Cygwin.

* tests/tagdemo.at: Use grep instead of egrep.

Signed-off-by: Peter Rosin <peda@lysator.liu.se>
bootstrap: fix version sort

Reported by Ozkan Sezer who suffered from makeinfo 4.13 being detected
as lesser than the required makeinfo 4.8.

* bootstrap (func_sort_ver): Sort numerically on the non-primary keys
as well.