Support i[456]86-pc{,-linux,-kfreebsd}-gnu.h
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Description

Support i[456]86-pc{,-linux,-kfreebsd}-gnu.h

* src/mkheader (canon_host_triplet): Add new entries.
* src/syscfg/lock-obj-pub.i486-pc-gnu.h: Rename to ...
* src/syscfg/lock-obj-pub.i686-pc-gnu.h: this.
* src/syscfg/lock-obj-pub.i486-pc-kfreebsd-gnu.h: Rename to ...
* src/syscfg/lock-obj-pub.i686-pc-kfreebsd-gnu.h: this.
* src/syscfg/lock-obj-pub.i486-pc-linux-gnu.h: Remove.
* src/Makefile.am (lock_obj_pub): Update.

i486-pc, i586-pc, and i686-pc all use the same ABI given the GNU
userland and a specific kernel.

This changeset updates the arch-specific lock-obj header generation to
treat the hardware aliases explicitly and should improve
cross-building for anyone wanting to target any of these 9
architectures.

It also removes src/syscfg/lock-obj-pub.i486-pc-linux-gnu.h, which
should be handled by the alias to
src/syscfg/lock-obj-pub.i686-pc-linux-gnu.h