Cache bypass: remove ifdefs under src/afs/LINUX

Cache bypass: remove ifdefs under src/afs/LINUX

Compile cache bypass code unconditionally under src/afs/LINUX
since it is now always enabled.  Also remove syslog messages
about a "cache bypass patched module" when loading and unloading
the module.

Reviewed-on: http://gerrit.openafs.org/3373
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 9657695d34badaac654227be8c731a1512f2106b)

Change-Id: I57c44352f11ca7f68f6c3644345a7d48da8c1bf9
Reviewed-on: http://gerrit.openafs.org/3645
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>