pdfstudio: remove libgccjit dependency

I don't think pdfstudio depends on libgccjit.  If it did, that would
be a license violation.  Unlike the other libraries in gcc,
libgccjit is licensed GPLv3 with no exceptions, since libgccjit
contains the entire compiler.

I wasn't able to build pdfstudio2022 prior to this PR due to openjdk
breakage.  However I did download and extract the `.deb` used, and
ran this command, which produced no outputs:

```
find . -name \*.so -exec ldd {} \; | grep libgccjit
```

Maybe somebody confused `libgccjit` with (may it rest in peace)
`libgcj`?

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