build: Refactor to ensure all headers run through compile

Change-Id: I06089ea54ace1acd79d4d12d9b7eb6cc01b38596
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meson.build b/meson.build
index d7dad2c..651089b 100644
--- a/meson.build
+++ b/meson.build
@@ -2,7 +2,7 @@
   'stdplus',
   'cpp',
   version: '0.1',
-  meson_version: '>=0.57.0',
+  meson_version: '>=0.63.0',
   default_options: [
     'warning_level=3',
     'cpp_std=c++20',