main/elfutils: also build elfutils binaries

Previously we only built libelf.a, but some things (e.g. flatpak-builder)
needs eu-strip (and other elfutils binaries)
7 jobs for !1638 with elfutils in 4 minutes and 46 seconds
latest detached
Status Job ID Name Coverage
  Lint
failed #17537
x86_64 docker-alpine allowed to fail
lint

00:00:28

 
  Build
failed #17542
aarch64 ci-build docker-alpine
build-aarch64

00:01:29

failed #17543
armv7 ci-build docker-alpine
build-armv7

00:01:49

failed #17541
ppc64le ci-build docker-alpine
build-ppc64le

00:01:21

failed #17540
s390x ci-build docker-alpine
build-s390x

00:00:46

passed #17539
x86 ci-build docker-alpine
build-x86

00:01:40

passed #17538
x86_64 ci-build docker-alpine
build-x86_64

00:01:38

 
Name Stage Failure
failed
build-armv7 Build
No job log
failed
build-aarch64 Build
No job log
failed
build-ppc64le Build
No job log
failed
build-s390x Build
No job log
failed
lint Lint
No job log