Backends: OpenGL3: Add compatibility of GL_VERSION for GL 2.x #2
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GL_MAJOR_VERSION and GL_MINOR_VERSION are available on GL 3.0 and above. So we have to parse GL_VERSION under GL 2.x
Reference https://www.khronos.org/opengl/wiki/OpenGL_Context#Context_information_queries
See ocornut/imgui#6154