allowing it to be overridden. Do the same in the PuTTY tests since it's
needed there and not exported by test-exec.sh.
OpenBSD-Regress-ID: c49dcd6aa7602a8606b7afa192196ca1fa65de16
allows overriding if necessary (eg in -portable where we're testing against a
specific version of OpenSSL).
OpenBSD-Regress-ID: 491f39cae9e762c71aa4bf045803d077139815c5
[regress/Makefile regress/test-exec.sh regress/putty-ciphers.sh]
[regress/putty-kex.sh regress/putty-transfer.sh regress/ssh2putty.sh]
basic (crypto, kex and transfer) interop regression tests against putty
To run these, install putty and run "make interop-tests" from the build
directory - the tests aren't run by default yet.