mkosi: install test dependencies for EnterNamespace= test

The test for the EnterNamespace= feature [0] has been both broken and
disabled since the migration to the mkosi framework, as it's missing the
libdw.pc file for pkg-config, so the test is skipped completely, and
it's also missing gcc to actually build the test binary.

[0] Part of TEST-87-AUX-UTILS-VM.coredump.sh

mkosi/mkosi.conf.d/arch/mkosi.conf

@@ -22,6 +22,7 @@ Packages=
         dbus-broker
         dbus-broker-units
         dhcp
+        elfutils
         erofs-utils
         f2fs-tools
         git
@@ -39,6 +40,7 @@ Packages=
         openssl
         pacman
         perf
+        pkgconf
         polkit
         procps-ng
         psmisc

mkosi/mkosi.conf.d/centos-fedora/mkosi.conf

@@ -28,6 +28,8 @@ Packages=
         device-mapper-event
         device-mapper-multipath
         dfuzzer
+        elfutils-devel
+        elfutils-libs
         erofs-utils
         git-core
         glibc-langpack-de
@@ -49,6 +51,7 @@ Packages=
         pam
         passwd
         perf
+        pkgconf
         policycoreutils
         polkit
         procps-ng

mkosi/mkosi.conf.d/debian-ubuntu/mkosi.conf

@@ -53,6 +53,8 @@ Packages=
         isc-dhcp-server
         knot
         libcap-ng-utils
+        libdw-dev
+        libdw1
         locales
         login
         man-db
@@ -63,6 +65,7 @@ Packages=
         openssh-server
         passwd
         polkitd
+        pkgconf
         procps
         psmisc
         python3-pexpect

mkosi/mkosi.conf.d/opensuse/mkosi.conf

@@ -58,6 +58,8 @@ Packages=
         knot
         libapparmor1
         libcap-progs
+        libdw-devel
+        libdw1
         libtss2-tcti-device0
         man
         multipath-tools
@@ -68,6 +70,7 @@ Packages=
         pam
         patterns-base-minimal_base
         perf
+        pkgconf
         procps4
         psmisc
         python3-pefile