added GFreeFunc and g_hash_table_set_key_freefunc() prototype. added

added GFreeFunc and g_hash_table_set_key_freefunc() prototype. added

Tue Nov 24 14:05:47 EST 1998	Michael K. Johnson <johnsonm@redhat.com>

	* glib.h: added GFreeFunc and g_hash_table_set_key_freefunc()
	prototype.
	* ghash.c: added g_hash_table_set_key_freefunc() implementation.
	Modified the prototypes of the functions g_hash_node_destroy() and
	g_hash_nodes_destroy(), and changed the functions that call them
	to match the new definitions.
	This changes no external interfaces, and should create no binary
	or source incompatibilities.  It does add a member to the
	GHashTable structure.