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Bunch of configure updates for xfsprogs  to allow packages to better be kept
in sync in this area.
Macro for auto-detecting available types on the system.

# 
# Check if we have a type for the pointer's size integer (__psint_t)
# 
AC_DEFUN([AC_TYPE_PSINT],
  [ AC_MSG_CHECKING([for __psint_t ])
    AC_TRY_COMPILE([
#include <sys/types.h>
#include <stdlib.h>
#include <stddef.h>
    ], [
         __psint_t  psint;
    ], AC_DEFINE(HAVE___PSINT_T) AC_MSG_RESULT(yes) , AC_MSG_RESULT(no))
  ])

# 
# Check if we have a type for the pointer's size unsigned (__psunsigned_t)
# 
AC_DEFUN([AC_TYPE_PSUNSIGNED],
  [ AC_MSG_CHECKING([for __psunsigned_t ])
    AC_TRY_COMPILE([
#include <sys/types.h>
#include <stdlib.h>
#include <stddef.h>
    ], [
        __psunsigned_t  psuint;
    ], AC_DEFINE(HAVE___PSUNSIGNED_T) AC_MSG_RESULT(yes) , AC_MSG_RESULT(no))
  ])

# 
# Check type sizes
# 
AC_DEFUN([AC_SIZEOF_POINTERS_AND_LONG],
  [ if test "$cross_compiling" = yes -a -z "$ac_cv_sizeof_long"; then
      AC_MSG_WARN([Cross compiling; assuming 32bit long and 32bit pointers])
    fi
    AC_CHECK_SIZEOF(long, 4)
    AC_CHECK_SIZEOF(char *, 4)
    if test $ac_cv_sizeof_long -eq 4; then
      AC_DEFINE(HAVE_32BIT_LONG)
    fi
    if test $ac_cv_sizeof_long -eq 8; then
      AC_DEFINE(HAVE_64BIT_LONG)
    fi
    if test $ac_cv_sizeof_char_p -eq 4; then
      AC_DEFINE(HAVE_32BIT_PTR)
    fi
    if test $ac_cv_sizeof_char_p -eq 8; then
      AC_DEFINE(HAVE_64BIT_PTR)
    fi
  ])