[evas/evas_3D] Uninitialized component of vector gl_FragColor in shadow_map shader

Summary:
@fix
During execution example evas-3d-obj, part of 3D objects showed with red ripple.
The reason is not completely initialize component vector gl_FragColor

Reviewers: cedric, Hermet

Reviewed By: Hermet

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2292

src/modules/evas/engines/gl_common/shader_3d/evas_gl_3d_shaders.x

@@ -1175,6 +1175,9 @@ static const char const shadow_map_frag_glsl[] =
    "#endif //DIFFUSE\n"
    "#endif //ALPHA_TEST_ENABLED\n"
    "void main() {\n"
+   "#ifndef NEED_TEX_COORD\n"
+   "   gl_FragColor = vec4(1);\n"
+   "#endif\n"
    "#ifdef ALPHA_TEST_ENABLED\n"
    "#ifdef DIFFUSE_TEXTURE_BLEND\n"
    "   gl_FragColor = (texture2D(uTextureDiffuse0, vTexCoord) *\n"

src/modules/evas/engines/gl_common/shader_3d/shadow_map_frag.shd

@@ -17,7 +17,9 @@ uniform float      uTextureDiffuseWeight;
 #endif //ALPHA_TEST_ENABLED
 
 void main() {
-
+#ifndef NEED_TEX_COORD
+   gl_FragColor = vec4(1);
+#endif
 #ifdef ALPHA_TEST_ENABLED
 
 #ifdef DIFFUSE_TEXTURE_BLEND