zathura: disable tests if cross

[ghost]

The only part of zathura that won't cross compile is the documentation and tests. Also, the dependency for synctex support (texlive) doesn't cross compile.

[ghost]

@ofborg build pkgsCross.aarch64-multiplatform.zathura

[apfelkuchen6]

Since this changes nothing for native builds, but at least builds for aarch64 on x86-64 (tested with #224901), I'm not opposed to merging this, but I'd strongly prefer fixing the stuff that does not work over disabling it:

• the manpages build when we use buildPackages.python3Packages.sphinx instead of python3.pkgs.sphinx and move check to buildInputs.
• synctex support works when texlive.bin cross-compiles, so I'd love to get texlive.bin.core{,-big}: fix cross compilation #223303 in instead (yes, I know that this is terrible to review)

[ghost]

• the manpages build when we use buildPackages.python3Packages.sphinx instead of python3.pkgs.sphinx and move check to buildInputs.

Done: 20860bf1129d1290de20bf378968720ce1105fb1

Note: it's easier to keep track of requests like this if you leave them as resolvable review comments.

• synctex support works when texlive.bin cross-compiles, so I'd love to get

I left a review.

[ghost]

If ofborg is successful with the two builds I asked it to do in #223303, I adjust this PR to keep texlive for cross builds.

[ghost]

Squashing...

[ghost]

@ofborg build pkgsCross.aarch64-multiplatform.zathura

[ghost]

@ofborg build zathura
@ofborg build pkgsCross.aarch64-multiplatform.zathura

[ghost]

@ofborg build pkgsCross.aarch64-multiplatform.zathura

[ghost]

Rebased, no other changes.

@ofborg build pkgsCross.aarch64-multiplatform.zathura

[ghost]

Ah right, this won't cross-build on master until #223303 is brought over from staging.