Progress on bringing the DomainMapper over

subprojects/packagefiles/stroid/build-check/meson.build

@@ -0,0 +1,7 @@
+# A subproject must not add global arguments after the parent defines targets.
+cpp = meson.get_compiler('cpp')
+add_project_arguments(
+  cpp.get_supported_arguments('-Wno-unused-command-line-argument'),
+  language: 'cpp',
+)
+subdir('CPPC')

subprojects/packagefiles/stroid/build-config/mfem/meson.build

@@ -0,0 +1,3 @@
+# The parent overrides this dependency with its selected MFEM build. Building
+# another copy here can change class layouts and cause crashes across the ABI.
+mfem_dep = dependency('mfem', version: '>=4.10')