Add gzip

[ghost]

What does this implement/fix? Explain your changes.

This adds gzip to the required dependencies for installing theos on iOS. The Theos installer would error out and not install when gzip wasn't installed.

Does this close any currently open issues?

No.

Any relevant logs, error output, etc?

No.

Any other comments?

No.

Where has this been tested?

Operating System: iOS 14.2

Platform: iOS

Jailbreak: Odysseyra1n

Target Platform: N/A

Toolchain Version: N/A

SDK Version: N/A

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[L1ghtmann]

Nice catch! I had previously assumed it would be preinstalled since most package managers depend on it (I think?).

The dependencies listed in the docs are just those required to run the install script, the actual build system dependencies are referenced in the installer itself, so it may be worth making this change there instead (https://github.com/theos/theos/blob/165cb1d6106907e2cab4c615f25faf5123d7d35c/bin/install-theos#L223).