KMI Whitelists: Drop old whitelist extraction methods

KMI Whitelists: Drop old whitelist extraction methods

The previous commit introduces a new (tested) way of creating function
and variable suppressions from multiple whitelist definitions. Migrate
to this new way of processing KMI whitelists.

	* include/abg-tools-utils.h
	(gen_suppr_spec_from_kernel_abi_whitelist): Delete declaration.
	* src/abg-tools-utils.cc
	(gen_suppr_spec_from_kernel_abi_whitelist): Delete definition
	and migrate users to gen_suppr_spec_from_kernel_abi_whitelists.
	* tools/abidiff.cc (set_suppressions): Migrate from using
	gen_suppr_spec_from_kernel_abi_whitelist to
	gen_suppr_spec_from_kernel_abi_whitelists.
	* tools/abidw.cc (set_suppressions): Likewise.
	* tools/abipkgdiff.cc: Drop unused using definition.
	* tools/kmidiff.cc: Likewise.

Reviewed-by: Dodji Seketeli <dodji@seketeli.org>
Signed-off-by: Matthias Maennich <maennich@google.com>