test old behaviour

Author: euanh

Sources/containertool/gzip.swift

@@ -56,9 +56,11 @@ func gzip(_ bytes: [UInt8]) -> [UInt8] {
     // compressed output for the same input,  but using the same default
     // value removes one one source of differences between platforms.
 
+/*
     let gz_os_unknown = Int32(255)
     var header = gz_header()
     header.os = gz_os_unknown
+*/
 
     let windowBits: Int32 = 15 + 16
     let level = Z_DEFAULT_COMPRESSION