Small changes to remove CMake warnings and cleanup code.

Author: eao197

dev/restinio/CMakeLists.txt

@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 3.10)
 
+cmake_policy(SET CMP0177 NEW)
+
 if(NOT RESTINIO_LIBRARY_NAME)
     # That must be the case when RESTinio is used as a dependency.
     set(RESTINIO_LIBRARY_NAME restinio)

externals.rb

@@ -42,14 +42,6 @@
 end
 
 MxxRu::arch_externals :catch do |e|
-  # NOTE: version 3.8.1 is not used because it leads to build errors
-  # somewhere in catch2/extras/CatchAddTests.cmake:234
-  # Something like:
-  #
-  # catch2/extras/CatchAddTests.cmake:138 (string):
-  # string sub-command JSON failed parsing json string: * Line 1, Column 1
-  #
-  # Syntax error: value, object or array expected.
   e.url 'https://github.com/catchorg/Catch2/archive/refs/tags/v3.10.0.tar.gz'
 
   e.map_dir 'src' => 'dev/catch2/'