[ns] Problem (with fix): setdest doesn't compile in ns-2.27

[John Heidemann]

Problem: setdest doesn't compile with an error like:

$ make
g++ -c -Dstand_alone -DSTL_NAMESPACE=@STL_NAMESPACE@  -o setdest.o
setdest.cc
In file included from ../../../config.h:54,
                 from setdest.h:5,
                 from setdest.cc:57:
../../../autoconf.h:85: error: namespace `CPP_NAMESPACE' undeclared
make: *** [setdest.o] Error 1
       

Solution:
see
file:///home/johnh/WORKING/VINT/www/ns/ns-problems.html#ns-2.27