[QT6] Add dynamic-layer and fix qtbase on xWayland

Remove from PACKAGECONFIG the package GLEv2 that prevents the configuration of the package qtbase when compiling for xWayland. The package is installed even if it's not in the PACKAGECONFIG.

The error is: | ERROR: Feature "opengles2": Forcing to "ON" breaks its condition: | NOT WIN32 AND NOT WATCHOS AND NOT QT_FEATURE_opengl_desktop AND GLESv2_FOUND | Condition values dump: | WIN32 = "" | WATCHOS = "0" | QT_FEATURE_opengl_desktop = "ON" | GLESv2_FOUND = "TRUE"