Correct whirlpool test

It depended on 'openssl no-wp', which always exited with code 0, so
this test would never be performed, and this, I never discovered that
the program it's supposed to run was misspellt.  Furthermore, the
feature to check is 'whirlpool', not 'wp'.

All corrected.
Reviewed-by: NStephen Henson <steve@openssl.org>

test/recipes/05-test_wp.t

@@ -2,4 +2,4 @@
 
 use OpenSSL::Test::Simple;
 
-simple_test("test_wp", "wptest", "wp");
+simple_test("test_wp", "wp_test", "whirlpool");