Revert "remove ifdef from glsl in glview shader - ifdefs not universally supported"

This reverts commit 54883cb7fb0c42f37615f1485e554d947b42c369.

legacy/elementary/src/bin/test_glview.c

@@ -327,6 +327,9 @@ static const char vertex_shader[] =
    "}\n";
 
  static const char fragment_shader[] =
+   "#ifdef GL_ES\n"
+   "precision mediump float;\n"
+   "#endif\n"
    "uniform vec4 color;\n"
    "uniform vec3 light;\n"
    "varying vec3 rotated_normal;\n"

legacy/elementary/src/bin/test_glview_simple.c

@@ -70,6 +70,9 @@ init_shaders(GLData *gld)
       "}                            \n";
 
    GLbyte fShaderStr[] =
+      "#ifdef GL_ES                                 \n"
+      "precision mediump float;                     \n"
+      "#endif                                       \n"
       "void main()                                  \n"
       "{                                            \n"
       "  gl_FragColor = vec4 ( 1.0, 0.0, 0.0, 1.0 );\n"