debian: force some dependencies

* i686 to use optimized version of the std lib
* libpulse (provide a sound plugin)
gitignore: debug file (linux)
gsdx-ogl: gl4.5: add plumbering to support direct_state_access and clip_control
gsdx-ogl: fix for gl_clear_texture

Note: Disabled for depth_stencil texture (I'm not sure we can split the two)
gsdx-ogl: fix ARB_bindless support
gsdx-ogl: add support of clip_control (depth only)

* replace the [-1;1] depth range of openGL with the DX range [0;1].
gsdx-ogl: drop GL_NV_depth_clamp extension

superseeded by GL_ARB_clip_control
gsdx-ogl: Enable various GL4+ extensions

* GL_ARB_clip_control: reduce z fighting
* GL_ARB_clear_texture: no real speed gain (but improve code quality)
* GL_ARB_bindless_texture: +1fps (if you're CPU limited)
gsdx-ogl: rework callback debug

* use DebugOutputToFile as a callback of gl error. Add a breakpoint to
  find the culprit GL call
* use string instead of char[n]

Note: CheckDebugLog is potentially useless now