Merge `create_patched_sdk*.sh` scripts + minor adjustments

[L1ghtmann]

What does this implement/fix? Explain your changes.

See title

Does this close any currently open issues?

No

Any relevant logs, error output, etc?

Any other comments?

• Expanded usage msg
• Converted spaces to tabs
• Added check for no args or --help for usage print
• Add sdk_platform to distinguish between iOS and tvOS patched sdk creation
• Swap tbd_tool check to [[ -x $tbd_tool ]] instead of command -v (which came up blank in all of my tests??)
• Added additional simruntime check for tvOS to match iOS (believe the old path was used for all OSes)
• Swapped realpath for readlink as the former doesn't appear to be available on stock OSX (?)
• Swapped various printf commands for echo when extra newlines weren't required

Where has this been tested?

Operating System: …

macOS 13

Platform: …

Target Platform: …

Toolchain Version: …

SDK Version: …

[leptos-null]

Thanks for merging these. I think this is easier to maintain going forward.