TCP NSC bugfix for 64 bit systems

the README edited, too

3rdparty/README

@@ -7,14 +7,24 @@ Supported software:
 
   Download NSC from: http://www.wand.net.nz/~stj2/nsc/
 
-  Extract the 'nsc-0.5.1.tar.bz2' tarball in this directory and build it.
+  Extract the 'nsc-0.5.2.tar.bz2' tarball in this directory and build it.
 
-  $ tar xvfj nsc-0.5.1.tar.bz2
-  $ cd nsc-0.5.1
+  $ tar xvfj nsc-0.5.2.tar.bz2
+
+  When you use it on a 64 bit system, you must use the 'nsc-0.5.2-amd64.patch'.
+  The NSC works with this patch on 32 bit system, too.
+
+  $ patch -p 1 <nsc-0.5.2-amd64.patch
+
+  Build the 'nsc-0.5.2'.
+
+  $ cd nsc-0.5.2
   $ python scons.py
 
   This should generate libfreebsd5.3.so, liblinux2.6.10.so, liblinux2.6.18.so,
-  liblinux2.6.26.so, liblwip.so, libopenbsd3.5.so in the nsc-0.5.1 directory.
+  liblinux2.6.26.so, liblwip.so, libopenbsd3.5.so in the nsc-0.5.2 directory.
+  When you use it on a 64 bit system, the generated libraries are
+  liblinux2.6.18.so and liblinux2.6.26.so only.
 
   Then rebuild INET.
 

3rdparty/nsc-0.5.2-amd64.patch

@@ -0,0 +1,15 @@
+--- a/nsc-0.5.2/linux-2.6.26/nsc/sim_support.cpp	2010-08-12 22:38:44.000000000 +0200
++++ b/nsc-0.5.2/linux-2.6.26/nsc/sim_support.cpp	2011-02-18 16:13:01.198735996 +0100
+@@ -428,9 +428,9 @@
+     {
+         // net/core/wmem_default = 106496
+         // net/core/wmem_max = 131071
+-        size_t oldval, oldlen = sizeof(oldval);
+-        size_t newval = size, newlen = sizeof(newval);
+-        size_t oldval3[3], newval3[3];
++        int oldval; size_t oldlen = sizeof(oldval);
++        int newval = size; size_t newlen = sizeof(newval);
++        int oldval3[3], newval3[3];
+         int err;
+
+         newval = size;