Use meson feature for lynx

This means you don't have to explicitly disable the lynx option to build
pavucontrol if you don't have lynx installed.

Signed-off-by: Alfred Wingate <parona@protonmail.com>

doc/meson.build

@@ -15,7 +15,7 @@ if tidy.found()
   test('XHTML documentation uses correct mark-up', tidy, args: ['-e', readme_html])
 endif
 
-if with_lynx
+if lynx.found()
   custom_target(
     'README',
     input: readme_html,

meson.build

@@ -4,8 +4,6 @@ project('pavucontrol', 'cpp',
         default_options : [ 'c_std=gnu11', 'cpp_std=c++17' ]
         )
 
-with_lynx = get_option('lynx')
-
 cpp = meson.get_compiler('cpp')
 
 gtkmm_dep = dependency('gtkmm-4.0', version : '>= 4.0', required : true)
@@ -21,7 +19,7 @@ have_pulse_messaging_api = cpp.has_function('pa_context_send_message_to_object',
 
 json_glib_dep = dependency('json-glib-1.0', required : have_pulse_messaging_api)
 
-lynx = find_program('lynx', required: with_lynx)
+lynx = find_program('lynx', required: get_option('lynx'))
 tidy = find_program('tidy', required: false)
 
 configinc = include_directories('.')

meson_options.txt

@@ -1,5 +1,5 @@
 option('lynx',
-       type : 'boolean', value : true,
+       type : 'feature', value : 'auto',
        description : 'Enable building of the README text file for installation')
 option('audio-feedback',
        type : 'feature', value: 'auto',