Manolo Gouy c0e04da27f Fix creation of OpenGL3+ context under X11 platform
The procedure given in https://www.khronos.org/opengl/wiki/Tutorial:_OpenGL_3.0_Context_Creation_(GLX)
is now followed. This gives access to contexts for the highest OpenGL version supported by the hardware
when flag FL_OPENGL3 is used in the call to Fl_Gl_Window::mode(int).

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@13021 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
2018-08-20 15:12:10 +00:00
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