That's strange, indeed... Also, I see 0 reference to libasound neither libSDL in the ldd outputs I get on my system, for either Snowglobe v1.4.2 plugin, stock Cool VL Viewer v1.26.0.14 plugin, or Cool VL Viewer v1.26.0.14 with 4.7.1_2 plugin... In fact, I get the exact same list of linked dynamic libraries, see by yourself:
My guess it that somehow, one of your systems' libraries that is required by the plugin itself requires those additional SDL and libasound dependencies... The question is why it lists it with working plugins and not with the plugins I compiled... I'm puzzled, to say the least.