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Find GLVND components if available. Add `GLX` and `EGL` options for COMPONENTS that allow requesting these libraries explicitly. Introduce new import targets for these windowing-system-specific libraries. On a GLVND system, populate the legacy `OPENGL_LIBRARIES` variable and the `OpenGL::GL` target using the `OpenGL` and `GLX` components. On non-GLVND systems, continue to use the legacy `GL` library and simply do not provide the GLVND components. Application code can choose to adapt based on the availability of GLVND components as imported targets.
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