Looking at http://sdl.beuc.net/...wiki/SDL_GLattr I see that SDL_GL_SetAttribute has an SDL_GL_ACCELERATED_VISUAL attribute available, so you can try using that.
Already tried, nothing new
Screen BPP: 24
Vendor : Microsoft Corporation
Renderer : GDI Generic
Version : 1.1.0
Extensions : GL_WIN_swap_hint GL_EXT_bgra GL_E
SDL_GL_RED_SIZE: requested 8, got 8
SDL_GL_GREEN_SIZE: requested 8, got 8
SDL_GL_BLUE_SIZE: requested 8, got 8
SDL_GL_DEPTH_SIZE: requested 24, got 32
SDL_GL_DOUBLEBUFFER: requested 1, got 1
SDL_GL_ACCELERATED_VISUAL: requested 1, got 1 !!!!!!
Although it says "got 1" for SDL_GL_ACCELERATED_VISUAL i dont have hardware acceleration... :S