Build venus tests with libtool

This was the only place doing -lafshcrypto_lwp on the command line.
(There are other consumers, which list libafshcrypto_lwp.a explicitly;
we can use the presence of libafshcrypto_lwp.a to track progress towards
not needing a LWP hcrypto build, which must come from the in-tree version.)

Convert the tests to build with libtool (as pthreaded), where we can
just throw in $(LIB_hcrypto) and deal with what we get.

Change-Id: Ibc99615d2ff03b8aebf956502a2a6b1cb26f0a65
Reviewed-on: http://gerrit.openafs.org/11479
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Tested-by: D Brashear <shadow@your-file-system.com>
Link aklog against LIB_hcrypto

This was the last place where libafshcrypto.a was explicitly referenced,
preventing the use of an out-of-tree hcrypto library.

We will continue to need to build the in-tree code to produce a
libafshcrypto_lwp.a library for use in LWP applications, until we
do not have any more LWP applications, but some systems (such as
Debian) have a desire to avoid bundled libraries, so we should
facilitate the use of an external libhcrypto where possible.

Many consumers of libafshcrypto_lwp.a will be removed when the
LWP versions of various modules are removed after 1.8 is branched.

Change-Id: I23049866caae9c16ffb2ec32c5e7b058465a26ba
Reviewed-on: http://gerrit.openafs.org/11480
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Tested-by: D Brashear <shadow@your-file-system.com>