libstrophe: update license and remove unused dep (#105555)
libstrophe: update license and remove unused dep (#105555)

See
https://github.com/Homebrew/homebrew-core/pull/105102#pullrequestreview-1029027205.
Homebrew/homebrew-core,sjackman/homebrew-core,adam-moss/homebrew-core,nandub/homebrew-core,adam-moss/homebrew-core,stgraber/homebrew-core,chrisfinazzo/homebrew-core,makigumo/homebrew-core,filcab/homebrew-core,lemzwerg/homebrew-core,filcab/homebrew-core,zyedidia/homebrew-core,chrisfinazzo/homebrew-core,nbari/homebrew-core,makigumo/homebrew-core,nandub/homebrew-core,stgraber/homebrew-core,sjackman/homebrew-core,lemzwerg/homebrew-core,zyedidia/homebrew-core,nbari/homebrew-core,Homebrew/homebrew-core