Add Linux fallocate support.

commit 749f5cc9
Author: Ulrich Drepper <drepper@redhat.com>
Date:   Mon Mar 2 16:15:58 2009 +0000

	* sysdeps/unix/sysv/linux/fallocate.c: New file.
	* sysdeps/unix/sysv/linux/fallocate64.c: New file.
	* sysdeps/unix/sysv/linux/wordsize-64/fallocate64.c: New file.
	* sysdeps/unix/sysv/linux/wordsize-64/fallocate.c: New file.
	* sysdeps/unix/sysv/linux/i386/fallocate64.c: New file.
	* sysdeps/unix/sysv/linux/i386/fallocate.c: New file.
	* sysdeps/unix/sysv/linux/Versions: Export fallocate and fallocate64
	for GLIBC_2.10.
	* sysdeps/unix/sysv/linux/Makefile [subdir=io] (sysdep_routines):
	Add fallocate and fallocate64.
	* io/fcntl.h: Pretty printing.