opengl: do not blindly reject all Microsoft's OpenGL implementations

This change enables libplacebo to work in the WSL2 (WSLg) environment where OpenGL is implemented on top of D3D12.

This reverts commit https://github.com/mpv-player/mpv/commit/149d98d24495550f7ee1e187225e2924b1b90024

Mentioned OpenGL implementation (GDI Generic) in the original change will be rejected by version check, so there is no need to handle it manually.

See-Also: https://github.com/mpv-player/mpv/pull/11061 Signed-off-by: Kacper Michajłow kasper93@gmail.com