renderer/native: Fallback to non-planar API if gbm_bo_get_handle_for_plane fails

Commit c0d9b08e replaced the old GBM API calls with the multi-plane GBM API. However, the call to gbm_bo_get_handle_for_plane fails for some DRI drivers (in particular i915). Due to missing error checks, the subsequent call to drmModeAddFB[2] fails and the screen output locks up.

This commit adds the missing error checks and falls back to the old GBM API (non-planar) if necessary.

v2: factor out multiplanar and old methods into separate functions.

Related to: #127 (closed)

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