remove pointer to long conversions - part 1 of 3 (trunk only)

P64 (Win64) has a 64 bit pointer size, but a 32 bit long size.
Remove some code that forced pointers into a long int, and
vice versa where information could be lost.

This part deals with light source functions and their
arguments mostly, and switches some arguments
from type genericptr_t to 'anything'.

src/polyself.c

@@ -357,7 +357,7 @@ int psflags;
 	    if (new_light == 1) ++new_light;  /* otherwise it's undetectable */
 	    if (new_light)
 		new_light_source(u.ux, u.uy, new_light,
-				 LS_MONSTER, (genericptr_t)&youmonst);
+				 LS_MONSTER, monst_to_any(&youmonst));
 	}
 }