update to 3.4.1

Changes:
  New:
    - fixed some Linux build problems
    - fixed some Windows build problems
    - GL_EXT_texture_env_dot3 extension (Gareth Hughes)
  Bug fixes:
    - added RENDER_START/RENDER_FINISH macros for glCopyTexImage in DRI
    - various state-update code changes needed for DRI bugs
    - disabled pixel transfer ops in glColorTable commands, not needed
    - fixed bugs in glCopyConvolutionFilter1D/2D, glGetConvolutionFilter
    - updated sources and fixed compile problems in widgets-mesa/
    - GLX_PBUFFER enum value was wrong in glx.h
    - fixed a glColorMaterial lighting bug
    - fixed bad args to Read/WriteStencilSpan in h/w stencil clear function
    - glXCopySubBufferMESA() Y position was off by one
    - Error checking of glTexSubImage3D() was broken (bug 128775)
    - glPopAttrib() didn't restore all derived Mesa state correctly
    - Better glReadPixels accuracy for 16bpp color - fixes lots of OpenGL
      conformance problems at 16bpp.
    - clearing depth buffer with scissoring was broken, would segfault
    - OSMesaGetDepthBuffer() returned bad bytesPerValue value
    - fixed a line clipping bug (reported by Craig McDaniel)
    - fixed RGB color over/underflow bug for very tiny triangles
  Known problems:
    - NURBS or evaluator surfaces inside display lists don't always work

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