package/systemd: fixup RPATH for more systemd host binaries

package/systemd: fixup RPATH for more systemd host binaries

All systemd binaries depend on libsystemd-shared and need their RPATH
fixed. Use a glob to catch them all.

We can't use $(wildcard ...) because this is expanded before any file
may exist (it's in the same rule that install those file, and the
expansion in Makefile is done once at the beginning of the recipe).

We need to test each file:
 1. to ignore files that were not build (e.g. because the host is
    missing some dependencies (in which case we don't care; we're only
    interested in systemctl, and that one is already built)
 2. to ensure the glob was expanded (in case no file would match
    systemd-*)

Signed-off-by: Norbert Lange <nolange79@gmail.com>
[yann.morin.1998@free.fr:
  - don't use 'set -e', use the more traditional '|| eixt 1'
  - don't cd into HOST_DIR/bin, but use $(addprefix ...)
  - use positive logic in the test
  - expand commit log
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>