* Makefile.in: Fixed to build in directories other than the top

* Makefile.in: Fixed to build in directories other than the top
of the source tree.

* generic/udp_tcl.c: Applied the patch from bug #810572 which
fixes a memory leak in udp_open - from D. Richard Hipp?

* generic/udp_tcl.h: Fix for missing define WIN32 sometimes.
* win/makefile.vc:  Added the standard windows nmake makefiles
* win/nmakehlp.c:   from the sampleextension project.
* win/rules.vc:     Visual Studio project updated as a Makefile
* win/tcludp.dsp:   project.