Change prototypes to use __iovec for struct iovec * parameters names rather

than __iovector which is reserved in GCC 4.3.

2009-08-03  Ryan S. Arnold  <rsa@us.ibm.com>

	* include/sys/uio.h (__readv, __libc_readv, __writev, __libc_writev):
	Change prototypes to use __iovec for struct iovec * parameters rather
	than __iovector which is a reserved word in GCC 4.3.