Let SRXAFS_GetStatistics64 return correct values for the workstations

Let SRXAFS_GetStatistics64 return correct values for the workstations

h_GetWorkstats was called also for 64bit which let random contents
in the other half of the 64bit field. Worse: little and big endian
machines filled different parts of the field so that a later masking
in fsprobe would net help for all kinds of servers.

Now a small wrapper h_GetWorkstats64 is called which calls h_GetWorkstats
correctly.

Change-Id: Iaeafd77dfa03d88caa98e4e352f95bfb33d736df
Reviewed-on: http://gerrit.openafs.org/2629
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>