Bug 1829725 - Disable neqo fuzzing feature. r=necko-reviewers,kershaw

Differential Revision: https://phabricator.services.mozilla.com/D176340

UltraBlame original commit: 6ea2977b2a55c21a1a44c3e023697e93070eb293

Author: marco-c

toolkit/library/rust/shared/Cargo.toml

@@ -124,7 +124,7 @@ spidermonkey_rust = []
 smoosh = ["jsrust_shared/smoosh"]
 gecko_profiler = ["gecko-profiler/enabled", "profiler_helper"]
 gecko_profiler_parse_elf = ["profiler_helper/parse_elf"]
-libfuzzer = ["neqo_glue/fuzzing"]
+libfuzzer = []
 webrtc = ["mdns_service"]
 glean_disable_upload = ["fog_control/disable_upload"]
 glean_million_queue = ["fog_control/million_queue"]