Convert tvb_get_ptr buffer access macros to use much safer tvb access macros.

Added a few filterable fields in the process of trying to figure out the macros.  Much more can be done to add many more filterable fields (and remove proto_tree_add_text calls hidden in the macros), but that'll be done some other time.

bug:10281
Change-Id: I9788f176c0e721ff4f243d4ecb79d7d0114fffc0
Reviewed-on: https://code.wireshark.org/review/3262
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
Fix cmake build for portaudio V18

Note that the cache file (CMakeCache.txt) must be cleared when the
include or library paths change, otherwise the cached result of
CHECK_FUNCTION_EXISTS will be re-used.

Change-Id: Ia18ed4f1b6b162499aeae6e66f612a4945390c2a
Reviewed-on: https://code.wireshark.org/review/3245
Reviewed-by: Jörg Mayer <jmayer@loplof.de>