2009-03-27 Sebastien Pouliot <sebastien@ximian.com>

2009-03-27  Sebastien Pouliot  <sebastien@ximian.com>

	* appdomain.h: Export a new callback type and a new function to
	set this callback. This allow a mono host to provide it's own
	definition for "platform code".
	* metadata-internals.h: Add a core_clr_platform_code flag on
	_MonoImage to (cache and) know if it is representing platform
	code.
	* image.c (do_mono_image_open): Set core_clr_platform_code flag
	on platform code images.
	* security-core-clr.c|h
	(mono_security_set_core_clr_platform_callback): Allow the host
	to provide it's own platform check definition.
	(mono_security_core_clr_determine_platform_image): Detect if an
	image is platform code (using the specified callback).
	(mono_security_core_clr_is_platform_image): Return cached value
	for platform code.

svn path=/trunk/mono/; revision=130389