2004-04-29  Simon Budig  <simon@gimp.org>

	* app/main.c: when glibc is used, call mallopt, so that memory
	chunks >= 4k (= 64*64 pixels, 1bpp - the smallest full tile)
	get allocated via mmap. This ensures that after closing an image
	the memory allocated for image data gets returned to the system.

	Thanks to Phil Blundell <pb@nexus.co.uk> for bringing mallopt
	to my attention.

	Please watch closely for performance problems.