CMake: Fix wx-config library list with monolithic build

Closes https://github.com/wxWidgets/wxWidgets/pull/1132

build/cmake/config.cmake

@@ -93,7 +93,8 @@ function(wx_write_config)
     set(STD_BASE_LIBS_ALL xml net base)
     set(STD_GUI_LIBS_ALL xrc html qa adv core)
     foreach(lib IN ITEMS xrc webview stc richtext ribbon propgrid aui gl media html qa adv core xml net base)
-        if(TARGET ${lib})
+        list(FIND wxLIB_TARGETS ${lib} hasLib)
+        if (hasLib GREATER -1)
             wx_string_append(BUILT_WX_LIBS "${lib} ")
             list(FIND STD_BASE_LIBS_ALL ${lib} index)
             if (index GREATER -1)
@@ -130,6 +131,9 @@ function(wx_write_config)
     wx_get_dependencies(EXTRALIBS_MEDIA media)
     wx_get_dependencies(OPENGL_LIBS gl)
     set(DMALLOC_LIBS)
+    if(wxBUILD_MONOLITHIC)
+        wx_get_dependencies(WXCONFIG_LIBS mono)
+    endif()
 
     set(CC ${CMAKE_C_COMPILER})
     set(CXX ${CMAKE_CXX_COMPILER})