Fix compilation of geometry grass sample with latest glow

5 jobs for feature/fix-geometry-grass-sample in 19 minutes and 44 seconds
Status Name Job ID Coverage
  Build
passed clang-buster #72938
Linux buster

00:18:08

passed clang-stretch #72940
Linux stretch

00:14:48

passed gcc-buster #72937
Linux buster

00:01:32

passed gcc-stretch #72939
Linux stretch

00:01:28

passed VS2017-x64 #72936
VS2017

00:03:26