Make ICC profile management thread safe.

The change to ref_count of profiles needs to be protected by a lock if
the profile ref_count could be changed by another thread. Also when
decrementing the ref_count to 0, we cannot free the lock until after
the profile has been unlocked.

New routine gsicc_adjust_profile_rc replaces old (not threadsafe) function
gsicc_profile_reference.

Also add tracing "cname" to the RC_ADJUST_ macro to aid in debugging
with -Z^ debug flag.

Testing had revealed race conditions which are now fixed (eliminate use
of semaphores).

This also changes the gsicc_lcms2art.c interface functions to keep a
list of transforms configured to have differing buffer formats that
include alpha, planar IN/OUT, big_endian IN/OUT, bytes_per_component
IN/OUT which are cloned as needed by threads.

Change gscms_is_threadsafe to return "true" in gsicc_lcms2art.c

TBD: If a link fails to build a thread may hang waiting for the link
profile to become valid if it was not the thread that was building it.
Not a new condition, but exposed when gscms_is_threadsafe returns true.

TBD: Fix error handling / clean-up when links fail to build. Also not
new, but is needed to prevent leaks, and possibly hang conditions.

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