Added a composer.json to enable support for PIE

[asgrim]

Adds support for PIE.

Once merged, a maintainer would need to add this repo's URL to https://packagist.org/packages/submit :)

More info/documentation can be read on: https://github.com/php/pie/blob/main/docs/extension-maintainers.md

[nikic]

Hm, I can't submit this on packagist under the krakjoe/ vendor name, and it doesn't look like @krakjoe has has been active recently.

Maybe it would make the most sense to call the composer package apcu/apcu?

[asgrim]

Hm, I can't submit this on packagist under the krakjoe/ vendor name, and it doesn't look like @krakjoe has has been active recently.

Maybe it would make the most sense to call the composer package apcu/apcu?

Seems reasonable! I can send a patch in tomorrow to update that.

[asgrim]

FYI, works nicely, thank you!

$ bin/pie install --with-php-config=/home/james/workspace/oss/php-src-build/bin/php-config apcu/apcu:dev-master
This command may need elevated privileges, and may prompt you for your password.
You are running PHP 8.3.11
Target PHP installation: 7.4.33 ts, on Linux/OSX/etc x86_64 (from /home/james/workspace/oss/php-src-build/bin/php)
Found package: apcu/apcu:dev-master which provides ext-apcu
phpize complete.
Configure complete with options: --with-php-config=/home/james/workspace/oss/php-src-build/bin/php-config
Build complete: /tmp/pie_downloader_66edbfab24a857.38933562/krakjoe-apcu-12e92f8/modules/apcu.so
Install complete: /home/james/workspace/oss/php-src-build/lib/php/extensions/debug-zts-20190902/apcu.so
You must now add "extension=apcu" to your php.ini