get SHADERDEF_UV1 back, not sure who removed it and why
get SHADERDEF_UV1 back, not sure who removed it and why

horryq/engine-1,3DGEOM/engine,nizihabi/engine,SuperStarPL/engine,sanyaade-teachings/engine,H1Gdev/engine,MicroWorldwide/PlayCanvas,sereepap2029/playcanvas,sanyaade-teachings/engine,sanyaade-teachings/engine,RainsSoft/engine,maxwellalive/engine,H1Gdev/engine,shinate/engine,RainsSoft/engine,3DGEOM/engine,MicroWorldwide/PlayCanvas,nizihabi/engine,SuperStarPL/engine,playcanvas/engine,guycalledfrank/engine,sereepap2029/playcanvas,guycalledfrank/engine,horryq/engine-1,horryq/engine-1,shinate/engine,aidinabedi/playcanvas-engine,maxwellalive/engine,maxwellalive/engine,shinate/engine,sereepap2029/playcanvas,RainsSoft/engine,3DGEOM/engine,nizihabi/engine,aidinabedi/playcanvas-engine,playcanvas/engine,SuperStarPL/engine