PHP: Add libjpeg and libwebp support

[adamziel]

Adds libjpeg and libwebp support to kitchen-sink and node.js builds.

All PHP versions got libjpeg, but only PHP >= 7.4 got libwebp. Getting it to work on 7.0 – 7.3 will require additional explorations.

Related to #1381 and #1175.

Testing instructions

• Confirm the CI tests pass
• Go to /phpinfo.php on your local dev server and confirm it lists jpeg and webp support in the "GD" section

[sejas]

Thanks for working on this 🙏 .

[adamziel]

It works for PHP 7.4 – it needs rebuilding all the kitchen sink and node versions of PHP and double-checking the uploads. I might not be able to get this to completion this week – @sejas would you like to take over from here?

[adamziel]

I found some time to rebuild the wasm files, let's see if the tests pass and ship

[adamziel]

It doesn't seem like it worked for the older PHP versions, I think they need different compilation flags

[adamziel]

I couldn't get libwebp to work for PHP <= 7.3 – the compiler complained about libwebp not being compiled with -fPIC even after I did compile it with those flags. 🤷 This PR, thus, ships libjpeg for all PHP versions, but libwebp only for PHP >= 7.3. Let's ship it as it is – we may always iterate on webp support later on.

[sejas]

It works for PHP 7.4 – it needs rebuilding all the kitchen sink and node versions of PHP and double-checking the uploads. I might not be able to get this to completion this week – @sejas would you like to take over from here?

Thanks again for working on this until completion. 🙌
Recompiling the PHP code to our needs is super awesome. Thank you!

[derekblank]

Thank you for addressing! 🙏 This change should resolve the issue of WebP support in Studio by pointing to a new release of the @php-wasm/node package with these changes. Anything that can be done from our end to help support a new release? (I'm not entirely sure if the @php-wasm/node package can be released independently of a full WordPress-Playground release.)

Edit: php-wasm/node has been released with v0.7.20 https://www.npmjs.com/package/@php-wasm/node 👍 🙇