configure.ac: fix build with automake 1.16.5
Fix the following build failure with convolution raised since automake
1.16.5 and
https://git.savannah.gnu.org/cgit/automake.git/commit/?id=
f4a3a70f69e1dbccb6578f39ef47835098a04624:
configure.ac:305: error: AM_INIT_AUTOMAKE expanded multiple times
/home/giuliobenetti/autobuild/run/instance-1/output-1/host/share/aclocal-1.16/init.m4:29: AM_INIT_AUTOMAKE is expanded from...
configure.ac:6: the top level
/home/giuliobenetti/autobuild/run/instance-1/output-1/host/share/aclocal-1.16/init.m4:29: AM_INIT_AUTOMAKE is expanded from...
configure.ac:305: the top level
Fixes:
- http://autobuild.buildroot.org/results/
464148bdccb705d8992dc860262bfdeb01b7e2a1
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>