Corrections to previous commit for SHA256 support.  Missed a couple
fixes in platform.mk.template.

I had made some fixes to platform.mk but had missed putting them into
platform.mk.template for the commit (platform.mk.template is used to
make platform.mk):

1) don't define SHA256 as that causes problems in the sha library
(sha.h).  That's why I changed the name to SHA256_FILE_HASH (in my
working copy, platform.mk).

2) Also needed to add the crypto library to CL_LDADD library so the
i-commands will link.



git-svn-id: svn://irodssvn.ucsd.edu/trunk@5613 ea137bd6-aa86-47b6-b90d-b101d9f19a90