Add php-enum to legacy-libraries

[sarjona]

No description provided.

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[sarjona]

I haven't been able to regenerate the libraries page. I'm getting this error when running it:

$ yarn libraries-generate
node:internal/modules/cjs/loader:1452
  return process.dlopen(module, path.toNamespacedPath(filename));
                 ^

Error: The module '/home/sara/workspace/devdocs/node_modules/libxmljs2/build/Release/xmljs.node'
was compiled against a different Node.js version using
NODE_MODULE_VERSION 108. This version of Node.js requires
NODE_MODULE_VERSION 109. Please try re-compiling or re-installing
the module (for instance, using `npm rebuild` or `npm install`).
    at Module._extensions..node (node:internal/modules/cjs/loader:1452:18)
    at Module.load (node:internal/modules/cjs/loader:1197:32)
    at Module._load (node:internal/modules/cjs/loader:1013:12)
    at Module.require (node:internal/modules/cjs/loader:1225:19)
    at require (node:internal/modules/helpers:177:18)
    at bindings (/home/sara/workspace/devdocs/node_modules/bindings/bindings.js:112:48)
    at Object.<anonymous> (/home/sara/workspace/devdocs/node_modules/libxmljs2/lib/bindings.js:1:37)
    at Module._compile (node:internal/modules/cjs/loader:1356:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1414:10)
    at Module.load (node:internal/modules/cjs/loader:1197:32) {
  code: 'ERR_DLOPEN_FAILED'

But hopefully, they'll be regenerated automatically (or when any library is updated).