sandbox fixes

Merged valoq requested to merge valoq/zathura:master into develop

Prevent zathura from crashing because of missing permissions to do exec in strict sandbox mode.

Note: Have been testing the strict mode for a while now and this seems to be the last bug caused by seccomp. It would be nice to have someone else test this as well, especially with latex features to possibly have the seccomp feature leave the experimental phase in the next release and get it enabled by default (in normal mode)

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