Added a readme that explains how to compile libpcap under win32.

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+Under Win32, libpcap is integrated in the WinPcap packet capture system. 
+WinPcap provides a framework that allows libpcap to capture the packets 
+under Windows 95, Windows 98, Windows ME, Windows NT 4, Windows 2000 
+and Windows XP.
+WinPcap binaries and source code can be found at http://winpcap.polito.it: 
+they include also a developer's pack with all the necessary to compile 
+libpcap-based applications under Windows.
+
+How to compile libpcap with Visual Studio
+-----------------------------------------
+
+In order to compile libpcap you will need:
+
+- version 6 (or higher) of Microsoft Visual Studio
+- The November 2001 (or later) edition of Microsoft Platform 
+Software Development Kit (SDK), that contains some necessary includes 
+for IPv6 support. You can download it from http://www.microsoft.com/sdk
+- the latest WinPcap sources from http://winpcap.polito.it/install 
+
+The WinPcap source code already contains a recent (usually the latest 
+stable) version of libpcap. If you need to compile a different one, 
+simply download it from www.tcpdump.org and copy the sources in the 
+winpcap\wpcap\libpcap folder of the WinPcap distribution. If you want to
+compile a libpcap source retrieved from the tcpdump.org CVS, you will 
+have to create the scanner and the grammar by hand (with lex and yacc) 
+or with the cygnus makefile, since The Visual Studio project is not able
+to build them.
+
+Open the project file winpcap\wpcap\prj\wpcap.dsw with Visual Studio and 
+build wpcap.dll. wpcap.lib, the library file to link with the applications, 
+will be generated in winpcap\wpcap\lib\. wpcap.dll will be generated in 
+winpcap\wpcap\prj\release or winpcap\wpcap\prj\debug depending on the type 
+of binary that is being created.
+
+How to compile libpcap with Cygnus
+----------------------------------
+
+To build wpcap.dll, cd to the directory WPCAP/PRJ of the WinPcap source code 
+distribution and type "make". libwpcap.a, the library file to link with the 
+applications, will be generated in winpcap\wpcap\lib\. wpcap.dll will be 
+generated in winpcap\wpcap\prj.
+
+Remember, you CANNOT use the MSVC-generated .lib files with gcc, use 
+libwpcap.a instead.
+
+"make install" installs wpcap.dll in the Windows system folder.