Fix the #defines for the presence of structure names.
AC_CHECK_MEMBER() and AC_CHECK_MEMBERS() use a standard name for the
{structurename} being the name of the structure type, complete with
"struct" if a typedef wasn't used, and with all letters mapped to upper
case, and with {membername} being the name of the structure member, with
all letters mapped to upper case.
check_struct_has_member() lets you choose the name; choose the same name
that the autoconf macros use, and fix the code to check for them.
Change-Id: Ifb3cf65e7e94907ad0a2f8aacca0c21a531f0c5b
Reviewed-on: https://code.wireshark.org/review/18382
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Reviewed-by: Guy Harris <guy@alum.mit.edu>