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'.

include/lev.h

@@ -43,7 +43,7 @@ typedef struct ls_t {
     short range;	/* source's current range */
     short flags;
     short type;		/* type of light source */
-    genericptr_t id;	/* source's identifier */
+    anything id;	/* source's identifier */
 } light_source;
 
 #endif /* LEV_H */