new icons in master are not found by the LyX executable

[Uwe Stöhr]

I just compiled master and started the resulting LyX.exe. As result I 
get tons of these warnings:

..\..\..\..\src\frontends\qt4\GuiApplication.cpp (612): Cannot load icon 
C:/LyXGit/Master/lib/images/index-insert.svgz please verify resource system!

I use CMake. The icons are in the directory so it is not clear to me why 
they are not found. Naybe it is a problem with the slashes in the folder?
Enrico, could you please have a look?

thanks and regards
Uwe