Provide locking macros, implement with pthreads.

Add _cairo_cache_shrink_to which reduces cache memory usage to a specified level.
Change global glyph and xlib glyphset caches behaviour to only shrink cache on unlock. This is done by telling the cache code to never shrink (max_memory == 0), and then manually shrinking using _cairo_cache_shrink_to from the unlock function.
Fix Carl's variable renaming mixing (cache = cache).
reviewed by: cworth

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