Bug#551465: Unable to load IMG_Load_RW function

[Ilia Lilov]

I have found solution for this trouble.
We just have to add -lSDL_image to g++ parameters (or to LDFLAGS
variable in Makefile).
It seems like newbie's mistake, but it isn't: my LDFLAGS contained
`paragui-config --libs` and I completly trusted to it's output. But
`paragui-config --libs` doesn't print -lSDL_image, which needed for
ParaGUI.
I think, mantainers should to fix paragui-config program.