RFR: 8313321 : Set minimum python version in WebKit cmake scripts [v2]

[John Neffenger]

On Mon, 14 Aug 2023 16:17:29 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

>> Minimum version of python ,to run webkit build , on linux is set to 3.6 and for other platforms, minimum version of python is set to 3.8.
>> 
>> Verified build on all platforms. No issue seen
>
> Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   change minimum version for mac to 3.6

Just a note that I was unable to build WebKit on Windows using the latest Python version 3.9 that comes with and up-to-date Cygwin installation due to the following issue:

* [Windows-style path is not recognized under cygwin](https://github.com/python/cpython/issues/90907)

I also couldn't find an easy way to "pin" the version number to keep Cygwin from upgrading it, so I had to revert the version manually each time I ran the Cygwin update tool. See my message on the mailing list for details:

* [Cygwin Python 3.9 breaks Windows WebKit build](https://mail.openjdk.org/pipermail/openjfx-dev/2023-January/037822.html)

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PR Comment: https://git.openjdk.org/jfx/pull/1205#issuecomment-1706877360