build(vendor-libraries): update install to be more reliable

vendor libaries for libconfig are now properly installed so linking can be done reliably

build-config/tomlpp/meson.build

@@ -0,0 +1,7 @@
+tomlpp_dep = dependency('tomlplusplus', required: true, static: true).as_system()
+
+install_subdir(
+    meson.project_source_root() / 'subprojects' / 'tomlplusplus-3.4.0' / 'include',
+    install_dir: get_option('includedir'),
+    strip_directory: true
+)