(AC_SYS_LARGEFILE_FLAGS,

(AC_SYS_LARGEFILE_FLAGS,
AC_SYS_LARGEFILE_SPACE_APPEND): Remove.
(AC_SYS_LARGEFILE_TEST_INCLUDES): New macro.
(AC_SYS_LARGEFILE_MACRO_VALUE): Change arguments from
CODE-TO-SET-DEFAULT to VALUE, INCLUDES, FUNCTION-BODY.
All uses changed.
Instead of inspecting the output of getconf, try to compile the
test program without and with the macro definition.
(AC_SYS_LARGEFILE): Do not require AC_CANONICAL_HOST or check
for getconf.  Instead, check for the needed flags by compiling
test programs.