bug in Thunderbird

[S. R. Wright]

PORTNAME=       thunderbird
DISTVERSION=    52.3.0
PORTREVISION=   1

Using the chat feature results in issues with at least XMPP (possibly 
others) as it tries to resolv SRV but cannot due to this error

 > prpl-jabber: Error during SRV lookup:
Error: Could not find libresolv in any of libresolv.9.so,libresolv.so 
Exception: Error: couldn't open library libresolv.so: Shared object 
"libresolv.so" not found, required by "thunderbird"