Rx: move TSFPQ prototypes from rx_globals.h to rx_protoypes.h

Rx: move TSFPQ prototypes from rx_globals.h to rx_protoypes.h

Function prototypes belong in rx_prototypes.h not in rx_globals.h.

Remove EXT macro from function prototypes as functions do not
require special treatment in order to be exported by a DLL on Windows.

Change-Id: Ieb617db634f2cfa57410e77e276c703311304547
Reviewed-on: http://gerrit.openafs.org/2777
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 00afdbed0ff474aaf45a49b157843af9cb8483ad)
Reviewed-on: http://gerrit.openafs.org/2812
Reviewed-by: Rod Widdowson <rdw@steadingsoftware.com>