configure: sort the lists for AC_CHECK_FUNCS and AC_CHECK_HEADERS

By using m4_flatten, should be easier to maintain these lists.

Regen configure and config.h.in after doing this.

(Modified by tytso to use m4_flatten for the list of header files
checked by AC_CHECK_HEADERS)

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
3 files changed