[Gc] Small resubmitted patch for controlling unmapping

[Ivan Maidanski]

Hi!

This small patch (superseding diff53) could be easily checked in "out-of-order".

The only thing it does is setting memory unmapping threshold value from an environment variable ("0" means no unmapping at all).

ChangeLog entries:

	* allchblk.c (MUNMAP_THRESHOLD): Move macro definition out of
	a function.
	* allchblk.c (GC_unmap_threshold): New global variable definition
	(initialized to MUNMAP_THRESHOLD).
	* allchblk.c (GC_unmap_old): Use GC_unmap_threshold instead of
	MUNMAP_THRESHOLD; skip unmapping if GC_unmap_threshold is 0.
	* doc/README.environment (GC_UNMAP_THRESHOLD): Add information.
	* misc.c (GC_unmap_threshold): New variable declaration.
	* misc.c (GC_init_inner): Recognize "GC_UNMAP_THRESHOLD"
	environment variable to set GC_unmap_threshold value (only if
	USE_MUNMAP).

Bye.
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