go.crypto: add PATENTS file to the subrepo.
go.crypto: add PATENTS file to the subrepo.

R=r
CC=golang-dev
https://golang.org/cl/6023044

tca/crypto,ScriptRock/crypto,bford/golang-x-crypto,mattharden/crypto,golang/crypto,kim-racktop/crypto,cmars/tools,zj8487/crypto,Carrotman42/crypto,cheffo/crypto,cheffo/crypto,zj8487/crypto,guaiguaihw/crypto,thomaso-mirodin/crypto,wooutl/golangcrypto,Carrotman42/crypto,juniorz/crypto,conseweb/golangcrypto,a-palchikov/crypto,progrium/crypto,cmars/tools,lucevers/crypto,CodyGuo/crypto,bford/golang-x-crypto,conseweb/golangcrypto,cmars/tools,ScriptRock/crypto,a-palchikov/crypto,mattharden/crypto,juniorz/crypto,golang/crypto,golang/crypto,pki-io/crypto,wooutl/golangcrypto,guaiguaihw/crypto,pki-io/crypto,lucevers/crypto,CodyGuo/crypto,kim-racktop/crypto,progrium/crypto,thomaso-mirodin/crypto,cmars/tools,tca/crypto