Reenable dispatch, its replacement TooManyCooks requires newer libcxx

Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -67,7 +67,6 @@ include(cmake/options.cmake)
 include(cmake/external/qt/package.cmake)
 
 set(desktop_app_skip_libs
-    dispatch
     glibmm
     variant
 )
