pkg/55888: xentools413 build failure - memcpy undefined

[prlw1%cam.ac.uk@localhost]

>Number:         55888
>Category:       pkg
>Synopsis:       xentools413 build failure - memcpy undefined
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 21 14:00:00 +0000 2020
>Originator:     Patrick Welche
>Release:        pkgsrc-current of Dec 20 11:09 GMT
>Organization:
>Environment:
NetBSD-9.99.77/amd64
>Description:
xentools 4.13.2nb2 is failing to bulid for me on -current (gcc) with

/usr/pkg/bin/gmake -C seabios-dir CC=gcc LD=ld PYTHON=python3.8 EXTRAVERSION="-Xen" all;
gmake[6]: Entering directory '/tmp/pkgsrc/sysutils/xentools413/work.x86_64/seabios-rel-1.12.1'
  Linking out/rom.o
ld -N -T out/romlayout32flat.lds out/rom16.strip.o out/rom32seg.strip.o out/code32flat.o -o out/rom.o
ld: out/code32flat.o: in function `memmove':
/tmp/pkgsrc/sysutils/xentools413/work.x86_64/seabios-rel-1.12.1/./src/string.c:206: undefined reference to `memcpy'
ld: out/code32flat.o: in function `const_read_file':
/tmp/pkgsrc/sysutils/xentools413/work.x86_64/seabios-rel-1.12.1/./src/romfile.c:116: undefined reference to `memcpy'
ld: out/code32flat.o: in function `tpm_log_event':
/tmp/pkgsrc/sysutils/xentools413/work.x86_64/seabios-rel-1.12.1/./src/tcgbios.c:131: undefined reference to `memcpy'
ld: /tmp/pkgsrc/sysutils/xentools413/work.x86_64/seabios-rel-1.12.1/./src/tcgbios.c:134: undefined reference to `memcpy'
ld: out/code32flat.o: in function `smm_save_and_copy':
/tmp/pkgsrc/sysutils/xentools413/work.x86_64/seabios-rel-1.12.1/./src/fw/smm.c:148: undefined reference to `memcpy'
ld: out/code32flat.o:/tmp/pkgsrc/sysutils/xentools413/work.x86_64/seabios-rel-1.12.1/./src/fw/smm.c:171: more undefined references to `memcpy' follow

>How-To-Repeat:

>Fix: