libwww suggested patch under win32

Attached is a small patch  to make libwww compile cleanly under the
fastcall calling convention provided with the /Gr of the microsoft
compiler.

Thanks for commenting about it and the possible integration into the
main source tree.

-- 
Fabrice Popineau
------------------------
e-mail:       Fabrice.Popineau@supelec.fr  |  The difference between theory 
voice-mail:   +33 (0) 387764715            |  and practice, is that
surface-mail: Supelec, 2 rue E. Belin,     |  theoretically,
	      F-57070 Metz 	           |  there is no difference !