Path-814: Corrected shader fragment compilation error.

indra/newview/app_settings/shaders/class1/interface/pathfindingF.glsl

@@ -24,12 +24,14 @@
  */
 
 #ifdef DEFINE_GL_FRAGCOLOR
-out vec4 gl_FragColor;
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
 #endif
 
 VARYING vec4 vertex_color;
 
 void main() 
 {
-	gl_FragColor = vertex_color;
+	frag_color = vertex_color;
 }