Revert "debian/patches: Consistently handle undefined values for integer functions"

Daniel van Vugtrequested to merge
vanvugt/gjs:fix-lp1918666 into debian/master

This reverts commit 11b2519a.

Because gnome-shell hasn't yet been updated to cope with the extra error checking and will break in random places until then.

Fixes:
https://bugs.launchpad.net/bugs/1918666,
https://bugs.launchpad.net/bugs/1918738

Edited by Daniel van Vugt

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