GL: Check sampler object support.

src/renderer_gl.cpp

@@ -2389,7 +2389,10 @@ namespace bgfx { namespace gl
 				if (BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGL)
 				||  BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGLES >= 30) )
 				{
-					GL_CHECK(glBindSampler(0, 0) );
+					if (m_samplerObjectSupport)
+					{
+						GL_CHECK(glBindSampler(0, 0) );
+					}
 				}
 			}
 		}