toolchain/54417: libarchive update broke the buils for ia64 and sun2

[martin%NetBSD.org@localhost]

>Number:         54417
>Category:       toolchain
>Synopsis:       libarchive update broke the buils for ia64 and sun2
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 28 10:45:00 +0000 2019
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.51
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD seven-days-to-the-wolves.aprisoft.de 8.99.51 NetBSD 8.99.51 (GENERIC) #291: Sat Jul 27 09:30:51 CEST 2019 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:

The sun2 and ia64 build fail in src/usr.bin/unzip with undefined
references to pthread symbols.

The requirement seems to come via libarchive, LIBDPLIBS and lzma,
but pthread is neither added to LDADD or DPADD.

Not sure if the previous version avoided the lzma or pthread reference.

>How-To-Repeat:

Try to build a sun2 release.

>Fix:
n/a