New issue by ahesford on void-packages repository

https://github.com/void-linux/void-packages/issues/40061

Description:
### Is this a new report?

Yes

### System Info

Void 5.15.63_1 x86_64 GenuineIntel notuptodate rFFFFFFFFFFFFFFFFFFF

### Package(s) Affected

pdf.js-2.16.105_1

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

None noted

### Expected behaviour

Visiting [a sample PDF](https://raw.githubusercontent.com/mozilla/pdf.js/master/examples/learning/helloworld.pdf) in qutebrowser should show an action dialog that presents `Ctrl+p` as an option to view the PDF with `pdf.js`. Choosing this option should open a new window with the `pdf.js` UI and a "Hello World" document displayed.

cc: @heittpr 

### Actual behaviour

Although the `pdf.js` UI is displayed, the content array is completely empty. Only the dark gray background is visible. Opening the qutebrowser web console with key combination `wIh` shows the following stack trace:

```
pdf.js:4213
Uncaught TypeError: key.split(...).at is not a function
    at new KeyboardManager (pdf.js:4213)
    at Function.<static_fields_initializer> (pdf.js:4369)
    at Array.Object.defineProperty.value (pdf.js:4342)
    at __w_pdfjs_require__ (pdf.js:19477)
    at Array.Object.defineProperty.value (pdf.js:3737)
    at __w_pdfjs_require__ (pdf.js:19477)
    at Array.Object.defineProperty.value (pdf.js:3562)
    at __w_pdfjs_require__ (pdf.js:19477)
    at Array.Object.defineProperty.value (pdf.js:1119)
    at __w_pdfjs_require__ (pdf.js:19477)
    
viewer.js:4333
Uncaught ReferenceError: require is not defined
    at Array.Object.defineProperty.value (viewer.js:4333)
    at __webpack_require__ (viewer.js:16331)
    at Array.pdfjsLib (viewer.js:1499)
    at __webpack_require__ (viewer.js:16331)
    at viewer.js:16367
    at viewer.js:16546
    at viewer.js:16548
    
viewer.html?filename=tmptkbvwf5m_helloworld.pdf&file=&source=https://raw.githubusercontent.com/mozilla/pdf.js/master/examples/learning/helloworld.pdf:466
Uncaught TypeError: Cannot read property 'set' of undefined
    at HTMLDocument.<anonymous> (viewer.html?filename=tmptkbvwf5m_helloworld.pdf&file=&source=https://raw.githubusercontent.com/mozilla/pdf.js/master/examples/learning/helloworld.pdf:466)
```

Downgrading to `pdf.js-2.14.305_1` fixes the problem.

### Steps to reproduce

1. `xbps-install qutebrowser pdf.js`
2. `qutebrowser "https://raw.githubusercontent.com/mozilla/pdf.js/master/examples/learning/helloworld.pdf"`
3. Press `Ctrl+p` to show broken PDF viewer
4. Press `wIh` to open the browser debug view, then choose the `Console` from the tabs to see the stack trace.