"epan/..." pathnames, so as to avoid collisions with header files in any
of the directories in which we look (e.g., "proto.h", as some other
package has its own "proto.h" file which it installs in the top-level
include directory).
Don't add "-I" flags to search "epan", as that's no longer necessary
(and we want includes of "epan" headers to fail if the "epan/" is left
out, so that we don't re-introduce includes lacking "epan/").
svn path=/trunk/; revision=4586
rather than a function pointer, "dissect_wtp_fromudp()" no longer needs
to be global; make it static, register it by name, and have the WSP
dissector get the handle by calling "find_dissector()" rather than by
constructing its own handle for it.
Fix up some attributions.
svn path=/trunk/; revision=4306
Guy Harris