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Regenerate pot/po files only if input has changed

StefanBruens requested to merge StefanBruens/poppler:fix_pot_regeneration into master

A custom target with ALL is always generated, even if the files/outputs specified with DPENDS are not changed.

This can be solved by generating the POT files with a custom_command. The target triggers evaluation of the custom_command, but the latter will only be run if the dependencies have changed.

Fixes #1479

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