Rx: PrintTheseStats should not be dependent on RXDEBUG

Rx: PrintTheseStats should not be dependent on RXDEBUG

When RXDEBUG is not defined, PrintTheseStats generates an error
even though the statistics are in fact available.  The global
variable rx_packetTypes was not being defined without RXDEBUG.

Make rx_packetTypes defined always and permit statistics to
always be printed.

Change-Id: Ife708d34b5d56374c8aff9aa7c941d39b37ca4a1
Reviewed-on: http://gerrit.openafs.org/2778
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit f1183f16285be040b7150414c9563a9bceb53210)
Reviewed-on: http://gerrit.openafs.org/2813
Reviewed-by: Rod Widdowson <rdw@steadingsoftware.com>