Fix bug in build Breeze with ECM 5.240.0 and Qt6

Jie Liu requested to merge (removed):master into master

We should set ECM_GLOBAL_FIND_VERSION to the actual ECM version used. When I build breeze with ECM 5.240 in Qt6 environment, QT_MAJOR_VERSION is set to 5 by ECM. It is because the value of ECM_GLOBAL_FIND_VERSION is set to 5.102.0 which is the ECM_FIND_VERSION rather than the actual ECM version used.

Signed-off-by: Liu Jie

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