Linux: Make all frontends optional

desmume/src/frontend/posix/meson.build

@@ -246,8 +246,12 @@ libdesmume = static_library('desmume',
   link_with: colorspacehandler_simd,
 )
 
-subdir('cli')
-subdir('gtk')
-if get_option('glade')
+if get_option('frontend-cli')
+  subdir('cli')
+endif
+if get_option('frontend-gtk')
+  subdir('gtk')
+endif
+if get_option('frontend-glade')
   subdir('gtk-glade')
 endif

desmume/src/frontend/posix/meson_options.txt

@@ -3,7 +3,17 @@ option('openal',
   value: false,
   description: 'Enable experimental OpenAL microphone input',
 )
-option('glade',
+option('frontend-gtk',
+  type: 'boolean',
+  value: true,
+  description: 'Enable GTK frontend',
+)
+option('frontend-cli',
+  type: 'boolean',
+  value: true,
+  description: 'Enable CLI frontend',
+)
+option('frontend-glade',
   type: 'boolean',
   value: false,
   description: 'Enable glade frontend',