cmake: Build win32 gui application if custom UI available

Signed-off-by: falkTX <falktx@falktx.com>

cmake/DPF-plugin.cmake

@@ -267,6 +267,9 @@ function(dpf__build_jack NAME HAS_UI)
       "${APPLE_COREMIDI_FRAMEWORK}")
   elseif(WIN32)
     target_link_libraries("${NAME}-jack" PRIVATE "dsound" "ole32" "winmm")
+    if(HAS_UI)
+      set_target_properties("${NAME}-jack" PROPERTIES WIN32_EXECUTABLE TRUE)
+    endif()
   endif()
 endfunction()