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Fix up auto-detection of available libc features being used by xfs_io; including sendfile, fadvise, madvise, etc.

# 
# Check if we have a working fadvise system call
# 
AC_DEFUN([AC_HAVE_FADVISE],
  [ AC_MSG_CHECKING([for fadvise ])
    AC_TRY_COMPILE([
#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <fcntl.h>
    ], [
	posix_fadvise(0, 1, 0, 0);
    ],	have_fadvise=yes
	AC_MSG_RESULT(yes),
	AC_MSG_RESULT(no))
    AC_SUBST(have_fadvise)
  ])

# 
# Check if we have a working madvise system call
# 
AC_DEFUN([AC_HAVE_MADVISE],
  [ AC_MSG_CHECKING([for madvise ])
    AC_TRY_COMPILE([
#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <sys/mman.h>
    ], [
	posix_madvise(0, 0, MADV_NORMAL);
    ],	have_madvise=yes
	AC_MSG_RESULT(yes),
	AC_MSG_RESULT(no))
    AC_SUBST(have_madvise)
  ])

# 
# Check if we have a working mincore system call
# 
AC_DEFUN([AC_HAVE_MINCORE],
  [ AC_MSG_CHECKING([for mincore ])
    AC_TRY_COMPILE([
#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <sys/mman.h>
    ], [
	mincore(0, 0, 0);
    ],	have_mincore=yes
	AC_MSG_RESULT(yes),
	AC_MSG_RESULT(no))
    AC_SUBST(have_mincore)
  ])

# 
# Check if we have a working sendfile system call
# 
AC_DEFUN([AC_HAVE_SENDFILE],
  [ AC_MSG_CHECKING([for sendfile ])
    AC_TRY_COMPILE([
#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <sys/sendfile.h>
    ], [
         sendfile(0, 0, 0, 0);
    ],	have_sendfile=yes
	AC_MSG_RESULT(yes),
	AC_MSG_RESULT(no))
    AC_SUBST(have_sendfile)
  ])