collada2gltf: compatibility fix: OpenGL ES 2.0 is enough

That's why it was worked in some case, when OpenGL ES is
available then it is the default and not the GLSL 1.1.

Change-Id: I60d545e76115396433df8dc300bc13935099c776

external/collada2gltf/patches/fix_linux_shader_compiling.patch.1

@@ -6,7 +6,7 @@ diff -ur collada2gltf.org/shaders/commonProfileShaders.cpp collada2gltf/shaders/
          
          GLSLShader(shared_ptr <GLTFProfile> profile) {
 -            this->_declarations = "precision highp float;\n";;
-+            this->_declarations = "#ifdef GL_ES_VERSION_3_0\n#version 300 es\n#else\n#version 130\n#endif\nprecision highp float;\n";
++            this->_declarations = "#ifdef GL_ES_VERSION_2_0\n#version 100 es\n#else\n#version 130\n#endif\nprecision highp float;\n";
              this->_body = "void main(void) {\n";
              this->_profile = profile;
          }