Print info from client capabilities we check

DRM_CLIENT_CAP_STEREO_3D: flags in drmModeModeInfo (see DRM_MODE_FLAG_3D_MASK, https://github.com/ascent12/drm_info/pull/14)
DRM_CLIENT_CAP_ASPECT_RATIO: flags in drmModeModeInfo (see DRM_MODE_FLAG_PIC_AR_MASK, https://github.com/ascent12/drm_info/pull/14)
DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: new connector type and a WRITEBACK_PIXEL_FORMATS property (https://github.com/ascent12/drm_info/pull/9)

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