Fix handling of autoclosing for compressed files (Closes: #741685)

Fix handling of autoclosing for compressed files (Closes: #741685)

AutoClose is both an argument in OpenDescriptor() and an enum. In
commit 84baaae93badc2da7c1f4f356456762895cef278 code using the AutoClose
parameter was moved to OpenDescriptorInternal(). In that function,
AutoClose meant the enum value, so the check was always false.