crash: Remove systemd library dependency

crash-reporter does no longer depend on systemd so this CL removes
the library dependency on build.

BUG=chromium:1066706
TEST=`cros_workon_make --board=lakitu crash-reporter` succeeded

Change-Id: Ibde30a18310cc01a13b328cbe5fee0885c6b6673
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2324093
Reviewed-by: Miriam Zimmerman <mutexlox@chromium.org>
Tested-by: Yoshiki Iguchi <yoshiki@chromium.org>
Auto-Submit: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
diff --git a/crash-reporter/BUILD.gn b/crash-reporter/BUILD.gn
index df333ec..b3550fd 100644
--- a/crash-reporter/BUILD.gn
+++ b/crash-reporter/BUILD.gn
@@ -170,10 +170,6 @@
 }
 
 pkg_config("anomaly_detector_config") {
-  # Laikitu uses systemd, while the rest of Chrome OS uses only the journald
-  # part of it, which has a different pkg-config name, but the same library.
-  libs = [ "systemd" ]
-
   # NOSORT
   pkg_deps = [
     "libbrillo",