[exim-dev] GnuTLS cipher names issue

I have a testsuite case, 2025, failing on one system:

2014-03-19 20:06:27 Exim configuration error:
tls_require_ciphers invalid:
gnutls_priority_init(!RSA_AES_256:DES-CBC3-SHA) failed at offset 0,
"!RSA_AES.." failed: The request is invalid.


Bisect fails it all the way back to 4.82 - I suspect the GnuTLS
library has been updated and invalidated the testcase.

The test startup reports:
Library version: GnuTLS: Compile: 2.8.5
                          Runtime: 2.8.5

Anyone else see this?
--
Cheers,
Jeremy