[Fluxus] multitexture automatic checking

[gabor papp]

> It should do - see GLSLShader::Init():
oh, cool. i didn't know about this, probably something is not right with
this check, because i get a segfault:

#0  0x00000000 in ?? ()
#1  0x026979d5 in Fluxus::GLSLShader::Unapply () at
libfluxus/src/GLSLShader.cpp:202
#2  0x02689564 in Fluxus::Renderer::PostRender (this=0x1016e00) at
libfluxus/src/Renderer.cpp:337
#3  0x0268b85d in Fluxus::Renderer::Render (this=0x1016e00) at
libfluxus/src/Renderer.cpp:136
#4  0x02629c3b in fluxus_render (argc=0, argv=0x9e4fa8) at
modules/fluxus-engine/src/FluxusEngine.cpp:149
#5  0x034a28fe in ?? () at iostream:76
#6  0x005fc572 in scheme_do_eval ()
#7  0x005fcb24 in _scheme_apply_multi_from_native ()
#8  0x009ae3c6 in ?? ()
#9  0x005fc572 in scheme_do_eval ()
#10 0x00600546 in eval_k ()
#11 0x00615d3c in scheme_top_level_do_worker ()
#12 0x00615ef1 in scheme_top_level_do ()
#13 0x00600a02 in scheme_eval_compiled_multi ()
#14 0x00600a54 in scheme_eval_multi ()


gabor