configure.ac: Stop using obsolete macros

Run autoupdate v2.71 to fix the following autogen.sh warnings:

configure.ac:33: warning: The macro `AC_CONFIG_HEADER' is obsolete.
configure.ac:33: You should run autoupdate.
./lib/autoconf/status.m4:719: AC_CONFIG_HEADER is expanded from...
configure.ac:33: the top level
configure.ac:49: warning: The macro `AC_PROG_LIBTOOL' is obsolete.
configure.ac:49: You should run autoupdate.
m4/libtool.m4:100: AC_PROG_LIBTOOL is expanded from...
configure.ac:49: the top level

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
1 file changed