sysroot: Make sure ld.co.conf only uses absolute paths

dpkg-shlibdeps doesn’t chdir() to /etc before parsing /etc/ld.so.conf,
which it needs to add multiarch paths to the library path list.
Not having multiarch files around, it fails to find any dependencies
except those in non-multiarch paths.

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

apertis-sysroot.yaml

@@ -17,7 +17,7 @@ actions:
 
   - action: run
     chroot: true
-    command: echo "include ld.so.conf.d/*.conf" > /etc/ld.so.conf
+    command: echo "include /etc/ld.so.conf.d/*.conf" > /etc/ld.so.conf
 
   - action: pack
     compression: gz