Remove dependencies that are now encapsulated by the CLI.

src/meson.build

@@ -4,8 +4,6 @@ executable('write-as-gtk',
 
     c_args: ['-include', 'config.h'],
     link_args: '-lm',
-    dependencies: [dependency('gtk+-3.0'),
-        dependency('libsoup-2.4'),
-        dependency('json-glib-1.0')],
+    dependencies: [dependency('gtk+-3.0')],
     install: true
 )