Allow ISO files larger than 4GiB

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#### Description
Right now due to how mkisofs is called, it's impossible to have files larger than 4GiB in the generated ISO. Consider adding `-iso-level 4` which would allow arbitrary file sizes. It may make sense to automatically try `-iso-level 4` if the previous attempt without it fails, this way it's backwards compatible.

#### Use Case(s)

I'm building a Packer file for Windows and need to upload some large installers. Due to [the issues with WinRM transferring large files](https://developer.hashicorp.com/packer/docs/provisioners/file#slowness-when-transferring-large-files-over-winrm) I'm left with the options of HTTP/SSH or CDROM. The CDROM/ISO option is the fastest by far, but doesn't support large files. This would fix that.

#### Potential configuration

```
source "qemu" "builder" {
vm_name = "windows_2012"
boot_wait = "0s"
accelerator = "kvm"
communicator = "winrm"
format = "qcow2"
cpus = 2
disk_size = var.disk_size
memory = var.memory
headless = var.headless
iso_url = var.iso_url
iso_checksum = var.iso_checksum
shutdown_command = "a:/sysprep.bat"
output_directory = "dist"
qemuargs = [
["-drive", "file=dist/{{ .Name }},if=virtio,cache=writeback,discard=ignore,format=qcow2,index=1"],
]
winrm_username = "vagrant"
winrm_password = "vagrant"
winrm_timeout = var.winrm_timeout
cd_files = ["large_installer.zip"]
}

```

#### Potential References
- https://linux.die.net/man/8/mkisofs