LV2 URI not well formed

[ccaudle]

Describe the bug
When running cmake the JUCEUtils.cmake reports a warning, which I believe is the cause of the LV2 plugin not loading in some applications:
CMake Warning at external/JUCE/extras/Build/CMake/JUCEUtils.cmake:981 (message):
LV2URI should be well-formed with an 'http' prefix. Check the LV2URI
argument to juce_add_plugin.
Call Stack (most recent call first):
external/JUCE/extras/Build/CMake/JUCEUtils.cmake:1091 (_juce_set_plugin_target_properties)
external/JUCE/extras/Build/CMake/JUCEUtils.cmake:1229 (_juce_link_plugin_wrapper)
external/JUCE/extras/Build/CMake/JUCEUtils.cmake:1770 (_juce_configure_plugin_targets)
CMakeLists.txt:101 (juce_add_plugin)

Desktop (please complete the following information):

• OS: Fedora Linux 40
• gRainbow version 1.0.3 zip file downloaded from github
• copied in linked external dependencies:
  ff_meters-968bb8e00c5e47aaf18b388341493edc771a088f
  RTNeural-e14dc6edfec24f0718bd86771dbb99368c968052
  JUCE-69795dc8e589a9eb5df251b6dd994859bf7b3fab

Another user has reported that "after running cmake you have to edit gRainbow_artefacts/JuceLibraryCode/JuceLV2Defines.h and change JucePlugin_LV2URI “/plugins/gRainbow” to JucePlugin_LV2URI “file://plugins/gRainbow”" but I do not know where the appropriate location would be to modify prior to running cmake.