gl-renderer: GL_EXT_texture_rg is a GL extension not and EGL extension

Look for GL_EXT_texture_rg in the GL extension list rather than
the EGL extension list.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
2 jobs for gl-ext-texture-rg in 1 minute and 2 seconds
latest
Status Job ID Name Coverage
  Container Prep
passed #270474
container_prep

00:00:30

 
  Build
passed #270475
build-native-meson

00:00:32