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e99b692e - Revert "examples: Don't error out from configure in hello-c-gnome3"

Revert "examples: Don't error out from configure in hello-c-gnome3" This reverts commit 5536ee522d6a9d60972c78882e2d2761cf9afdc9. It was not necessary since xsmallpot.sh removes unneeded lines from configure.ac.