Fix crash on some OpenGLES devices

On some older OpenGLES devices, attempting to bind textures to
unsupported compressed formats can crash. So explicitly disable the
unsupported formats so this never happens.

src/renderer_gl.cpp

@@ -1451,7 +1451,21 @@ namespace bgfx { namespace gl
 					setTextureFormat(TextureFormat::BGRA8, GL_RGBA, GL_BGRA, GL_UNSIGNED_BYTE);
 				}
 			}
+			
+#ifdef BGFX_CONFIG_RENDERER_OPENGLES
+			// on some older devices attempting glTexImage2D or glCompressedTexImage2D with unsupported compressed formats can crash
+			// so disable the format by setting to GL_ZERO
+			for (uint32_t ii = 0; ii < TextureFormat::Unknown; ++ii)
+			{
+				if ( !s_textureFormat[ ii ].m_supported )
+				{
+					s_textureFormat[ ii ].m_internalFmt = GL_ZERO;
+					s_textureFormat[ ii ].m_internalFmtSrgb = GL_ZERO;
+				}
+			}
+#endif
 
+			
 			if (BX_ENABLED(BX_PLATFORM_EMSCRIPTEN)
 			||  !isTextureFormatValid(TextureFormat::R8) )
 			{