Export CC and CFLAGS for c89 test.

Add c89 here too.

Add test against OpenSSL w/out ECC.

Ensure we can still build with C89.

Interop test agains PuTTY.

Support testing against arbitary libcrytpo vers.

Add tests against various LibreSSL and OpenSSL versions.

Add fbsd10 test target.

Disable compiler hardening on nbsd4.

The system compiler supports -fstack-protector-all, but using it will
result in an internal compiler error on some files.

Add nbsd3, nbsd4 and nbsd9 test targets.

Comment out nbsd2 test target for now.

Add OPENBSD ORIGINAL marker.

Replace "==" (a bashism) with "=".

Add nbsd2 test target.

Add obsd68 test target.

Remove dependency on bash.

Add obsd67 test target.

Re-add macos-11.0 test target.

Add openindiana test target.

Test krb5 on Solaris 11 too.

Don't always set SUDO.

Rely on sourcing configs to set as appropriate.

Remove now-unused 2nd arg to configs.

Add win10 test target.

Add nbsd8 test target.

Add obsd51 target.

Add fbsd13 target.