contrib: qt5compat: do not use Qt Shader Tools + disable building core5
Statically linking to Qt Shader Tools seems to increase the binary size quite a lot.
Revert the patch which introduced runtime shader compilation to QtGraphicalEffects so that Qt Shader Tools is not linked.
TODO: Remove Qt5Compat completely, and use MultiEffect instead.
Additionally, disable building core5 as it is not used.
Edited by Fatih Uzunoğlu