user/php7: fix build with dash-binsh (hopefully)

See merge request adelie/packages!424

Bump PHP to 7.4.4

See merge request adelie/packages!423

* Use system libgd
* Use system oniguruma
* Upstream has migrated from pcre to pcre2
* Drop comments about extensions that aren't being built (imap, recode,
  sodium, tidy)
* Drop php7-wddx (has been removed from core upstream)
* Drop php7-litespeed (I don't think anyone uses this)
* Pin subpackage versions to main package
* Fix _extensions_by_load_order so all extensions are tested
  * This increases the test suite size from ~ 9000 to ~ 15000
* Add additional API/ABI checks from Fedora