Errors compiling lyx2.4 with gcc 5.4.0

[Kornel Benko]

Attached the the errors for src/frontends/qt/GuiRef.cpp and
src/frontends/qt/GuiWorkArea.cpp.

This is on a debian computer used by my wife, so I am somewhat reluctant to upgrade there.
If I create a package on a different computer, the resulting executable does not run
there because it expects many newer libraries.

	Kornel
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