Log Message:
slibtool: update to 0.5.19

Changes:
	This patch release includes several improvements in the driver logic,
	as well as one important fix to the compile mode logic.

	- driver: support -export-dynamic.
	- driver: allow flavor-based use of native tools (ar,ranlib,etc.)
	- driver: slbt_init_host_params(): improve native target detection logic.
	- driver: -shrext support: only use the extension portion of the extension.
	- compile mode: gnu libtool compatibility: do not add -c to compiler arguments.