.cmake.conf: set QT_EXTRA_INTERNAL_TARGET_DEFINES in one command


More readable and in line with other modules.

Pick-to: 6.11 6.8
Change-Id: I7943ea1116a4f3027d1b9f74b72e93e407af90ea
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
commite0945677a218fff94fc1af861103b154f6ac41d0
parentb247e89a7c72beb47a78d3593c0c75ccaaa57bff
authorMarc Mutz <marc.mutz@qt.io>
committerVolker Hilsheimer <volker.hilsheimer@qt.io>
commit timeMon, 4 May 2026 10:44:29 +0000