Fix make check for outfashioned m4

[Stepan Kasal]

Hello,
  the testsuite stumbled over my M4 1.4.3.  I enhanced the
reformatting in tests/local.at to fix that.
When I was there, I updated the comment and added the missing
explanation for  s/ E[A-Z]*$//

OK to commit?

[I seem to recall a reasoning that this behaviour is half-wanted:
it might make people to upgrade their m4.  Well, feel free to add
a warning to configure then.]

Stepan

autoconf-20060908-m4-1.4.patch
Description: Text document