main/libarchive: add secfixes comment

ref #10926
7 jobs for !960 with libarchive in 2 minutes and 6 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #10222
x86_64 docker-alpine
lint

00:00:19

 
  Build
passed #10227
aarch64 ci-build docker-alpine
build-aarch64

00:01:06

passed #10228
armv7 ci-build docker-alpine
build-armv7

00:01:20

passed #10226
ppc64le ci-build docker-alpine
build-ppc64le

00:01:03

passed #10225
s390x ci-build docker-alpine
build-s390x

00:01:45

passed #10224
x86 ci-build docker-alpine
build-x86

00:01:09

passed #10223
x86_64 ci-build docker-alpine
build-x86_64

00:01:10