cmake,meson: Set minimum glib version to 2.72

This version is required for glib-based tests with AF_UNIX support
under Windows.

As dbus is at the beginning of a new development branch and 2.72
is quite old (2022), the minimum version has been unconditionally
raised.

CMakeLists.txt

@@ -182,7 +182,8 @@ endif()
 
 find_package(EXPAT)
 find_package(X11)
-find_package(GLIB2)
+set(GLIB_MIN_VERSION 2.72) # for AF_UNIX
+find_package(GLIB2 ${GLIB_MIN_VERSION})
 if(GLIB2_FOUND)
     option(DBUS_WITH_GLIB "build with glib" ON)
 endif()

meson.build

@@ -397,11 +397,12 @@ endif
 # a running dbus-daemon will be disabled if message_bus is not set.
 message_bus = get_option('message_bus')
 
+minimum_glib = '2.72'    # for AF_UNIX
 if get_option('modular_tests').disabled()
     glib = dependency('', required: false)
 else
     glib = dependency(
-        'glib-2.0', version: '>=2.40',
+        'glib-2.0', version: '>=' + minimum_glib,
         required: get_option('modular_tests'),
         fallback: ['glib', 'libglib_dep'],
         default_options: fallback_subproject_options + [