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When cross-compiling for Windows, I had this warning:
> plug-ins/file-ico/ico-load.c:221:22: warning: format '%lu' expects
> argument of type 'long unsigned int', but argument 5 has type 'long
> long unsigned int' [-Wformat=]

I guess that on some platform sizeof may be a long long uint. Just cast
the result to long uint instead (I could have done the other way around,
but I doubt the struct type IcoFileEntry would ever get bigger than long
uint max!).