archivers/php-brotli: Update version 0.19.0=>0.20.0

Changelog:
https://github.com/kjdev/php-ext-brotli/releases/tag/0.20.0

Commit log:
https://github.com/kjdev/php-ext-brotli/compare/0.19.0...0.20.0

remove config.m4 patch, which has been upstreamed
undo 63b6120db0b8290c6b7d0b91d16c94bfe617ebfe

PR: 296523
Approved by: submitter is maintainer