Removed glut from build instructions

Documentation/DeveloperHelpSources/building.docu

@@ -10,7 +10,6 @@ OpenFlipper.
 \section reqlibs Required libraries
 <ul>
 <li> 5.9 >= Qt >= 5.5.1  ( http://www.qt.io/download/ ) Use the OpenGL version for Qt >= 5.0</li>
-<li> GLUT         ( http://www.opengl.org/resources/libraries/glut/ )</li>
 <li> GLEW (>=1.6) ( http://glew.sourceforge.net )</li>
 </ul>
 
@@ -82,9 +81,6 @@ directory.
 <li> Download the glew library and install it (The best way is to install it to c:\\libs\\glew directory ).)<br />
      The c:\\libs\\glew\\lib subdirectory should contain the dll and the *.lib files)<br />
      The headers should be located in the c:\\libs\\glew\\include\\gl subdirectory</li>
-<li> Rearrange the files in the glut-3.7 directory such that)<br />
-     all *.lib and *.dll files are in a c:\\libs\\glut-3.7\\lib subdirectory)<br />
-     and the glut.h file is moved to the subdirectory c:\\libs\\glut-3.7\\include\\gl\\glut.h</li>
 <li> Get cmake for windows from http://www.cmake.org/cmake/resources/software.html </li>
 <li> Start the cmake gui and select the OpenFlipper toplevel directory as source directory </li>
 \image html cmake-source.png
@@ -121,7 +117,6 @@ Don't forget setting up the "OpenFlipper" target as startup project as shown in
      Install at least the following ports: <br />
      qt4-mac +debug<br />
      glew<br />
-     glut<br />
      cmake<br />
 br />
      As additional ports we recommend the following<br />