Make boost a system include

meson.build

 project('harbour-konheko', 'cpp', default_options: ['cpp_std=c++17', 'b_pie=true'])
 
 qt5 = import('qt5')
-qt5_dep = dependency('qt5', modules: ['Core', 'Qml', 'Quick', 'DBus'])
+qt5_dep = dependency('qt5', modules: ['Core', 'Qml', 'Quick', 'DBus'], include_type: 'system')
 inc = include_directories('src')
 
 cmake_pref = get_option('cget_prefix')
@@ -11,9 +11,9 @@ boost_dep = dependency('boost', modules : [
 	'iostreams',
 	'system',
 	'thread'
-	], static: true)
+	], static: true, include_type: 'system')
 zlib_dep = dependency('zlib')
-olm_dep = dependency('Olm', method : 'cmake', cmake_module_path : cmake_pref + '/Olm', static: true)
+olm_dep = dependency('Olm', method : 'cmake', cmake_module_path : cmake_pref + '/Olm', static: true, include_type: 'system')
 matrix_dep = dependency('MatrixClient', method : 'cmake', cmake_module_path : cmake_pref + '/MatrixClient', static: true)
 json_dep = dependency('nlohmann_json', method : 'cmake', modules : ['nlohmann_json::nlohmann_json'], cmake_module_path : cmake_pref + '/nlohmann_json', static: true)
 ssl_dep = dependency('OpenSSL', static: true)