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`?

pkgs/applications/misc/pdfstudio/default.nix

@@ -8,10 +8,11 @@
 # - year identifies the year portion of the version, defaults to most recent year.
 # - pname is either "pdfstudio${year}" or "pdfstudioviewer".
 
-{ program ? "pdfstudio"
+{ lib
+, program ? "pdfstudio"
 , year ? "2022"
 , fetchurl
-, libgccjit
+, gcc
 , callPackage
 , jdk11
 , jdk17
@@ -49,7 +50,7 @@ in
       sha256 = "sha256-wQgVWz2kS+XkrqvCAUishizfDrCwGyVDAAU4Yzj4uYU=";
     };
     extraBuildInputs = [
-      libgccjit #for libstdc++.so.6 and libgomp.so.1
+      (lib.getLib gcc)  # for libstdc++.so.6 and libgomp.so.1
     ];
     jdk = jdk11;
   };
@@ -62,7 +63,7 @@ in
       sha256 = "sha256-B3RrftuKsPWUWP9hwnq4i311hgZgwZLqG1pJLdilfQI=";
     };
     extraBuildInputs = [
-      libgccjit #for libstdc++.so.6 and libgomp.so.1
+      (lib.getLib gcc)  # for libstdc++.so.6 and libgomp.so.1
     ];
     jdk = jdk17;
   };