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php-master: Fix a build issue on PHP < 7.4.0RC1
The `--enable-xml` flag was renamed in 7.4.0RC1 to `--with-xml`: php/php-src@9f0c9b7 But `generic.nix` applies the old flag for `lib.versionOlder php.version "7.4"` so we need to re-add it manually to also cover 7.4 development versions.