This patch corrects compile errors when we build -maltivec

This patch corrects compile errors when we build -maltivec

where gcc-4.3 takes vector as a key word.

2009-07-31  Steven Munroe  <munroesj@us.ibm.com>

	* misc/readv.c (__libc_readv): Change vector to io_vector to
	avoid -altivec keyword.
	* misc/writev.c (__libc_writev): Ditto.
	* sysdeps/posix/readv.c (__libc_readv): Ditto.
	* sysdeps/posix/writev.c (__libc_writev): Ditto.
	* sysdeps/unix/sysv/linux/readv.c (do_readv, __libc_readv):
	Ditto.
	* sysdeps/unix/sysv/linux/writev.c (do_writev, __libc_writev):
	Ditto.