Remove more obsolete files

source/Irrlicht/source.txt

@@ -1,40 +0,0 @@
-Source code of the Irrlicht Engine
-
-The complete source of the Irrlicht Engine can be found when decompressing
-the .zip file included in this directory. 
-Please note that YOU DO NOT NEED THIS SOURCE to develop 3d applications with
-the Irrlicht Engine. Instead, please use the .dll in the \bin directory, the 
-.lib in the \lib directory and the header files in the \include directory.
-
-You will find a good tutorial how to set up your development environment and to
-use the engine in the \examples directory. (Try 1.helloworld)
-
-The source of the engine is only included because of the following reasons:
-
-	- To let developers be able to debug the engine.
-	- To let developers be able to make changes to the engine.
-	- To let developers be able to compile their own versions of the engine.
-	
-	
-	
-HOW TO COMPILE THE ENGINE WITH LINUX
-
-If you wish to compile the engine in linux yourself, unzip the source source.zip
-file in the \source directory. Run a 'make' in the now existing new subfolder 'Irrlicht'.
-After this, you should be able to make all example applications in \examples.
-Then just start an X Server and run them, from the directory where they are.
-
-If you get a compiling/linking problem like 
-
- undefined reference to `glXGetProcAddress'
- 
-Then there are several solutions: 
-A) This disables the use of OpenGL extensions:
-  Open the file IrrCompileConfig.h, comment out _IRR_OPENGL_USE_EXTPOINTER_,
-  and recompile Irrlicht using 
-  make clean
-  make
-B) Replace all occurrences of 'glXGetProcAddress' with 'glXGetProcAddressARB' and run a
-   make
-   This will solve the issue but keep the OpenGL extension enabled.
-