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: I9241adf8ce73df70fb7e50cc50f16015322bea5b
diff --git a/subprojects/acpi-power-state-daemon/meson.build b/subprojects/acpi-power-state-daemon/meson.build
index 48d6a1e..5f83a0f 100644
--- a/subprojects/acpi-power-state-daemon/meson.build
+++ b/subprojects/acpi-power-state-daemon/meson.build
@@ -26,10 +26,11 @@
 headers = include_directories('.')
 
 systemd = dependency('systemd')
+libsystemd = dependency('libsystemd')
 systemunitdir = systemd.get_variable('systemdsystemunitdir')
 
 deps = [
-  systemd,
+  libsystemd,
   dependency('sdbusplus', fallback: ['sdbusplus', 'sdbusplus_dep']),
   dependency(
     'phosphor-dbus-interfaces',