netgen: update win to work with newly rebased version

Author: looooo

netgen/bld.bat

@@ -1,4 +1,4 @@
-mkdir build -p
+mkdir build
 cd build 
 
 cmake .. -G "Ninja" ^
@@ -22,4 +22,4 @@ mkdir %LIBRARY_PREFIX%\include\netgen -p
 rem this line is not correct. There is already a mydef.hpp in the include files
 rem better just move the config.h and make FreeCAD-cmake look for a congfig.h instead of 
 rem a mydefs.hpp
-Copy %SRC_DIR%\build\config.h %LIBRARY_PREFIX%\include\netgen\mydefs.hpp
+Copy %LIBRARY_PREFIX%\include\include\mydefs.hpp %LIBRARY_PREFIX%\include\netgen\mydefs.hpp