oid_registry: allow arbitrary size OIDs

oid_registry: allow arbitrary size OIDs

The current OID registry parser uses 64 bit arithmetic which limits us to
supporting 64 bit or smaller OIDs.  This isn't usually a problem except
that it prevents us from representing the 2.25.  prefix OIDs which are the
OID representation of UUIDs and have a 128 bit number following the
prefix.  Rather than import not often used perl arithmetic modules,
replace the current perl 64 bit arithmetic with a callout to bc, which is
arbitrary precision, for decimal to base 2 conversion, then do pure string
operations on the base 2 number.

[James.Bottomley@HansenPartnership.com: tidy up perl with better my placement also set bc to arbitrary size]
Link: https://lkml.kernel.org/r/dbc90c344c691ed988640a28367ff895b5ef2604.camel@HansenPartnership.com
Link: https://lkml.kernel.org/r/833c858cd74533203b43180208734b84f1137af0.camel@HansenPartnership.com
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Blaise Boscaccy <bboscaccy@linux.microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>