replaced Linux-specific mallinfo()-based memory limiting with a more portable and faster hack

 * Works by "hooking" into malloc() and friends and counting the
   usable heap object sizes with malloc_usable_size().
   Thus, it has no memory-overhead.
 * Will work at least on Linux and (Free)BSD.
   Other UNIXoid systems may work as well - this is tested by ./configure.
 * Usually faster than even the fallback implementation since the
   memory limit is hit earlier.
 * A similar approach could be tried on Windows (TODO).
 * A proper memory-limiting counting all malloc()s in the system can make
   a huge difference as this test case shows:
   sciteco -e '<@EU[X^E\a]"^E\a"%a>'
   It will allocate gigabytes before hitting the 500MB memory limit...
 * Fixed the UNIX-function checks on BSDs.

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