meson: switch code dependency to libsystemd

For a while now systemd has packaged a separate `libsystemd`.  For
meson dependency, `systemd` should be used when looking for systemd
service file paths and `libsystemd` should be used for `sd_*` functions.

Update the dependency accordingly.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9768dd66c4180085f201a0b77385d696bdd1680f
diff --git a/libipmid/meson.build b/libipmid/meson.build
index ebd932c..20dbfe1 100644
--- a/libipmid/meson.build
+++ b/libipmid/meson.build
@@ -1,9 +1,9 @@
 ipmid_pre = [
   boost,
+  libsystemd_dep,
   phosphor_dbus_interfaces_dep,
   phosphor_logging_dep,
   sdbusplus_dep,
-  systemd,
 ]
 
 entity_map_json_lib = static_library(