[cl-gd-devel] cl-gd on mac os x

[bryan d. o'connor]

since i was unable to get cl-gd to work on mac os x with openmcl
1.0-rc1 or sbcl 0.9.5 and uffi-1.5.4, i decided to try it out
with cffi-uffi-compat (cffi-luis branch).

there were a few bugs exposed in cffi-uffi-compat, but Luis has
been very quick to fix them.

with the latest version, cl-gd now runs fine.  only one test
(test-017) fails, but the output visually appears similar.

included below is a patch.  it adds/changes:
- how to compile the dylib for mac os x to docs and Makefile
- adds .dylib to *shared-library-types*
- changes the .asd file to use cffi-uffi-compat for openmcl.

i didn't change it to use cffi-uffi-compat for sbcl since
sbcl on x86 users might prefer uffi.  something detailing
this should probably be added to the docs.

thanks,

     ...bryan