SOLARIS: Do not build x86 kernel module on 5.11

SOLARIS: Do not build x86 kernel module on 5.11

Oracle Solaris 11 no longer supports x86 (amd64 is required). If we
try to build the x86 module, /usr/include/sys/kobj.h complains that
the ISA is unsupported, and refuses to go on. So, just remove
MODLOAD32 from the libafs directories to build on sunx86_511.

Reviewed-on: http://gerrit.openafs.org/5835
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit c6a22d67ff9787ace2249d528eb9db99c5b19427)

Change-Id: I00f9f19653a2f98276c236d7e2331bc81f7c4f13
Reviewed-on: http://gerrit.openafs.org/6643
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>