ethereal rpm tweaks

[Curtis Doty]

I just noticed that the Fedora ethereal rpm requests net-snmp support but 
it is never actually turned on. If this is a bug, the solution is to 
explicitly enable the ssl crypto library; then net-snmp support will 
compile in too.

Also, I've found the concurrent dns feature quite handy and have had 
success compiling against Dag's adns rpm. I've not bothered to try the one 
in extras.

Current:
Compiled with GLib 2.4.8, with libpcap 0.8.3, with libz 1.2.1.2,
without libpcre, without UCD-SNMP or Net-SNMP, without ADNS.

Proposed:
Compiled with GLib 2.4.8, with libpcap 0.8.3, with libz 1.2.1.2,
without libpcre, with Net-SNMP 5.1.2, with ADNS.

Linked is an example diff which also includes a few missing build deps.
http://www.greenkey.net/~curtis/rpm/src/SPECPATCH/ethereal-0.10.9/ethereal.spec.patch.html

../C