change iov_base's type from `char *' to standard `void *'

[Jeremy C. Reed]

I saw that Xorg's xcb assumes iov_base as void *. Looking closer I saw the 
note "iov_base should be a void *" in sys/sys/uio.h.

I haven't tried myself, but someone submit update in:
http://leaf.dragonflybsd.org/mailarchive/submit/2006-01/msg00030.html

The FreeBSD commit says:
 Change iov_base's type from `char *' to the standard `void *'.  All
 uses of iov_base which assume its type is `char *' (in order to do
 pointer arithmetic) have been updated to cast iov_base to `char *'.

Does this matter?

 Jeremy C. Reed

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