Disable library validation for macOS builds

This seems to be required, at least for now, to make
it work with unsigned extensions.

example/export_presets.cfg

@@ -90,7 +90,7 @@ codesign/entitlements/custom_file=""
 codesign/entitlements/allow_jit_code_execution=false
 codesign/entitlements/allow_unsigned_executable_memory=false
 codesign/entitlements/allow_dyld_environment_variables=false
-codesign/entitlements/disable_library_validation=false
+codesign/entitlements/disable_library_validation=true
 codesign/entitlements/audio_input=false
 codesign/entitlements/camera=false
 codesign/entitlements/location=false