cleanup: Reformat with clang

Also update required meson version to support
`get_variable` and remove deprecated get_pkgconfig_variable.

Change-Id: I1a0d5a9fce077d546cf56078b63c49ee52f1a816
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/meson.build b/meson.build
index 578638b..e6c407d 100644
--- a/meson.build
+++ b/meson.build
@@ -2,7 +2,7 @@
   'google-ipmi-sys',
   'cpp',
   version: '0.1',
-  meson_version: '>=0.57.0',
+  meson_version: '>=0.63.0',
   default_options: [
     'cpp_std=c++20',
     'warning_level=3',
@@ -106,5 +106,5 @@
     'gbmc-psu-hardreset.target',
     'gbmc-psu-hardreset-pre.target',
     'gbmc-psu-hardreset-time.service',
-    install_dir: systemd_dep.get_variable(pkgconfig: 'systemdsystemunitdir'))
+    install_dir: systemd_dep.get_variable('systemdsystemunitdir'))
 endif