vp9_spatial_svc_encoder.sh: Prevent failures when ssvc is unavailable.
vp9_spatial_svc_encoder.sh: Prevent failures when ssvc is unavailable.

Avoid running the tests when CONFIG_SPATIAL_SVC is 0.

Change-Id: I9b87ed206a9ba7de6827594fba275bd3f60faf2d

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imaginemedia/webm.libvpx,GrokImageCompression/aom,jmvalin/aom,lyx2014/libvpx_c,liqianggao/libvpx,stewnorriss/libvpx,Maria1099/webm.libvpx,ittiamvpx/libvpx,matanbs/webm.libvpx,shareefalis/libvpx,openpeer/libvpx_new,mwgoldsmith/vpx,shacklettbp/aom,ittiamvpx/libvpx,lyx2014/libvpx_c,GrokImageCompression/aom,luctrudeau/aom,shacklettbp/aom