[Lazarus] Qt5 IDE fails to build on Linux

[Giuliano Colla]

Attempting to build latest Lazarus trunk on Linux CentOs7 with Qt5 fails 
with error:

/home/colla/Applicazioni/lazarus_main/lcl/interfaces//qt5/qtobject.inc:44: 
undefined reference to `QGuiApplication_setFallbackSessionManagementEnabled'

It succeeds setting

{$DEFINE QT_NO_SESSIONMANAGER}

in qtdefines.inc

My cbindings outdated or bug?

Giuliano

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