9040: Don't label derive macros with their banged_name r=Veykril a=Veykril
cc https://github.com/rust-analyzer/rust-analyzer/issues/7072#issuecomment-850396203
This doesn't fix it non builtin derives yet I think cause of a FIXME somewhere that doesn't categorize proc-macro derives as derives yet
bors r+
Co-authored-by: Lukas Wirth <lukastw97@gmail.com>