databases/mongodb80: patch is not necessary anymore

The same flag was set upstream in

branch v7.0: (a few days after I committed the patch)
https://github.com/mongodb/mongo/commit/7a0dcfa565aba4aaef159bf09cfaf2269678eb6c

master (which became 8.0):
https://github.com/mongodb/mongo/commit/ad8a74f5782fb8b3f24f74305c44da725732616a