[Utility] Make fopen and its closure return generic type T
[Utility] Make fopen and its closure return generic type T

JGiola/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,vmanot/swift-package-manager,sschiau/swift-package-manager,sschiau/swift-package-manager,JGiola/swift-package-manager,mxcl/swift-package-manager,haskellswift/swift-package-manager,JGiola/swift-package-manager,abertelrud/swift-package-manager,vmanot/swift-package-manager,JGiola/swift-package-manager,haskellswift/swift-package-manager,mxcl/swift-package-manager,abertelrud/swift-package-manager,haskellswift/swift-package-manager,abertelrud/swift-package-manager,sschiau/swift-package-manager,JGiola/swift-package-manager,apple/swift-package-manager,vmanot/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,vmanot/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,vmanot/swift-package-manager,mxcl/swift-package-manager,sschiau/swift-package-manager,sschiau/swift-package-manager,haskellswift/swift-package-manager,mxcl/swift-package-manager