[darcs-devel] portability fixes for tests

[Dave Love]

This bunch of patches fixes portability problems with the test suite.
The shell scripts use non-POSIX (GNU-ish) features, but the Solaris
/bin/sh isn't POSIX-conformant anyway.  There may be more things worth
fixing, but this seems to be enough for Solaris 10.

There are still failures in a couple of the test scripts which I
haven't been able to debug yet, but it looks as though they're
genuine problems.

Sun Feb 25 11:21:24 GMT 2007  Dave Love <fx at gnu.org>
  * Make test harnesses define PWD in environment in case shell doesn't.

Sun Feb 25 11:30:41 GMT 2007  Dave Love <fx at gnu.org>
  * Get `open' and `psignal' declared on Solaris.
  The header requirements for open are actually as documented for glibc.

Sun Feb 25 11:32:16 GMT 2007  Dave Love <fx at gnu.org>
  * Fix bash-ism `export foo=' in tests.

Sun Feb 25 11:32:55 GMT 2007  Dave Love <fx at gnu.org>
  * Don't depend on `seq' in tests.

Sun Feb 25 11:34:02 GMT 2007  Dave Love <fx at gnu.org>
  * Fixes for Solaris sh in tests: no $(...), test -e, or ! pipelines.

Sun Feb 25 11:39:49 GMT 2007  Dave Love <fx at gnu.org>
  * In tests, don't assume diff has -c, -x flags.

Sun Feb 25 11:40:22 GMT 2007  Dave Love <fx at gnu.org>
  * In tests, don't assume grep has -q and -x flags.

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