pkg/55580: pkgsrc/audio/sox build failure

[beceeh%shaw.ca@localhost]

>Number:         55580
>Category:       pkg
>Synopsis:       pkgsrc/audio/sox fails to build
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 17 01:20:00 +0000 2020
>Originator:     brad.harder%gmail.com@localhost
>Release:        NetBSD 9.99.71
>Organization:
	method logic digital
>Environment:
System: NetBSD katy 9.99.71 NetBSD 9.99.71 (GENERIC) #22: Sun Aug 16 12:47:02 PDT 2020 root@katy:/usr/src_current/sys/arch/amd64/compile/obj/GENERIC amd64
Architecture: x86_64
Machine: amd64

nb: 9-Stable userland
>Description:
	sox repeatedly failed to build when updating ./pkgsrc/audio/libsndfile.
>How-To-Repeat:
	# cd ./pkgsrc/audio/sox
        # make clean
        # make
>Fix:
  --- Makefile    2020-08-16 17:55:38.175758843 -0700
  +++ -   2020-08-16 17:55:49.610344178 -0700
  @@ -30,6 +30,7 @@
   # failed to convert strong functions and variables: Invalid type identifier
   CTF_FILES_SKIP+=       lib/libsox.so.3.0.0

  +.include "../../audio/libopus/buildlink3.mk"
   .include "../../audio/flac/buildlink3.mk"
   .include "../../audio/gsm/buildlink3.mk"
   .include "../../audio/libmad/buildlink3.mk"