Examples: Remove nonexistent include from QMake project file


Since QMake now complains about nonexistent includes we have to remove
those.

Pick-to: 6.12
Change-Id: I2bbd8120fe63d108e9a40f7f457f422e8ec2ec4a
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
commitc86ecb95cc51037caf1f5fe69222f2809337b269
parentbfbb3601f2895172e8c250eabf3e2fe39af81086
authorJoerg Bornemann <joerg.bornemann@qt.io>
committerJoerg Bornemann <joerg.bornemann@qt.io>
commit timeFri, 23 Oct 2026 10:56:08 +0000