Fixing rebuildswift
Fixing rebuildswift

The script was complaining about a missing dir under tmp. The pathing
just appeared to be incorrect. After making the minor change included
in this commit, the script ran successfully.

swiftstack/vagrant-swift-all-in-one,swiftstack/vagrant-swift-all-in-one,osanai-hisashi/vagrant-swift-all-in-one,notmyname/vagrant-swift-all-in-one,osanai-hisashi/vagrant-swift-all-in-one,swiftstack/vagrant-swift-all-in-one,swiftstack/vagrant-swift-all-in-one,notmyname/vagrant-swift-all-in-one,osanai-hisashi/vagrant-swift-all-in-one,notmyname/vagrant-swift-all-in-one,osanai-hisashi/vagrant-swift-all-in-one,notmyname/vagrant-swift-all-in-one