Enable lean headers in qtspeech


At first only level 1, as QML headers are not level-2 clean, yet.

Task-number: QTBUG-145302
Pick-to: 6.11 6.10 6.8
Change-Id: I2eba998fb3beda9be399333b23633114e338bc7f
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
commite0def625fc40747c5a7bf18e01e5413437773cb8
parent52e99e6e8f4cc74918a6d8f4b6ed8449d4ff5859
authorMarc Mutz <marc.mutz@qt.io>
committerMarc Mutz <marc.mutz@qt.io>
commit timeFri, 27 Mar 2026 16:59:45 +0100