rsaenh: Revert part of d3c482250a8232e9657ecefb3e61fff0194e3fbe

[Juan Lang]

> It fails for me:

The trouble is, the test is invalid.  It imports a key using
CRYPT_IPSEC_HMAC_KEY, which Wine currently ignores.  rsaenh currently
doesn't implement HMAC.  The chromium tests, on which this test case
was built, also checks the resulting output from using this key, and
Wine currently fails these tests too (bug 20340.)  So the Wine test
case that's currently succeeding is misleading:  you can import a key
16 bytes in length, but if you use it expecting to use HMAC, you'll
get the wrong result.

I'll submit tests that show the appropriate key length, but I still
think this part of the test should be reverted.
--Juan