[binutils-gdb] Reinstate readelf decoding of i860, i960 and i370 relocs

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT f954747f10467071b0acde07ee5f5e268ab606a6 ***

Author: Alan Modra <amodra@gmail.com>
Branch: master
Commit: f954747f10467071b0acde07ee5f5e268ab606a6

Reinstate readelf decoding of i860, i960 and i370 relocs

include/
	* elf/i370.h: Revert removal.
	* elf/i860.h: Likewise.
	* elf/i960.h: Likewise.
binutils
	* readelf.c: Revert 2018-04-16 and 2018-04-11 changes.