meson: State clearly maintainer mode is not supported for MSVC

fanc999-1 · fanc999-1 · commit 5760f95a08bf · 2019-12-11T16:55:43.000+08:00
Instead of showing that 'mm-common-get' is not found, just state clearly
that maintainer mode is not supported for Visual Studio builds at all.
diff --git a/meson.build b/meson.build
@@ -71,6 +71,10 @@ build_documentation = build_documentation_opt == 'true' or \
 build_examples = get_option('build-examples')
 do_benchmark = get_option('benchmark')
 
+if is_msvc and maintainer_mode
+  error('Maintainer mode is not supported for Visual Studio builds.\nUse \'-Dmaintainer-mode=false\' to disable')
+endif
+
 # Installation directories are relative to {prefix}.
 install_prefix = get_option('prefix')
 install_includedir = get_option('includedir')
