This is to bring in the newly introduced support for bpf-*-* targets.

ChangeLog:

2019-05-23  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* config.guess: Synchronize with config project master sources.
	* config.sub: Likewise.
	* readline/support/config.guess: Likewise.
	* readline/support/config.sub: Likewise.