Build break - port amd64 - xsetwallpaper

[Paul Goyette <paul%whooppee.com@localhost>]

With sources updates just a short time ago...

#      link  xsetwallpaper/xsetwallpaper
/build/netbsd-local/tools/x86_64/amd64/bin/x86_64--netbsd-gcc    
--sysroot=/build/netbsd-local/dest/amd64 -Wl,-rpath,/usr/X11R7/lib 
-L=/usr/X11R7/lib     -o xsetwallpaper  xsetwallpaper.o stb_image.o -lm -lX11   
    -Wl,-rpath-link,/build/netbsd-local/dest/amd64/lib  -L=/
libx86_64--netbsd-gcc: xsetwallpaper.o: No such file or directory
*** [xsetwallpaper] Error code 1

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