No longer consider automake warnings as fatal

With automake 1.14 there are a lot of new warnings related to the way we deal
with MEX files (they are compiled from source files located in a different
tree). Automake wants us to use the 'subdir-objects' option, but it breaks in
our case.

In automake 2.0, the 'subdir-objects' option will be activated by default, so
we will have to refactor the build system for MEX files. But for now we can
live with the automake warnings.

configure.ac

@@ -20,7 +20,7 @@ dnl along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 AC_PREREQ([2.62])
 AC_INIT([dynare], [4.4-unstable])
 AC_CONFIG_SRCDIR([preprocessor/DynareMain.cc])
-AM_INIT_AUTOMAKE([1.11 -Wall -Wno-portability -Werror foreign no-dist-gzip dist-xz tar-pax])
+AM_INIT_AUTOMAKE([1.11 -Wall -Wno-portability foreign no-dist-gzip dist-xz tar-pax])
 
 AC_PROG_CC
 AC_PROG_CXX

mex/build/matlab/configure.ac

@@ -20,7 +20,7 @@ dnl along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 AC_PREREQ([2.62])
 AC_INIT([dynare], [4.4-unstable])
 AC_CONFIG_SRCDIR([configure.ac])
-AM_INIT_AUTOMAKE([-Wall -Wno-portability -Werror foreign])
+AM_INIT_AUTOMAKE([-Wall -Wno-portability foreign])
 
 dnl The following must occur before we modify CFLAGS/CXXFLAGS
 AC_CANONICAL_HOST

mex/build/octave/configure.ac

@@ -20,7 +20,7 @@ dnl along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 AC_PREREQ([2.62])
 AC_INIT([dynare], [4.4-unstable])
 AC_CONFIG_SRCDIR([configure.ac])
-AM_INIT_AUTOMAKE([-Wall -Wno-portability -Werror foreign])
+AM_INIT_AUTOMAKE([-Wall -Wno-portability foreign])
 
 AC_CHECK_PROG([MKOCTFILE], [mkoctfile], [mkoctfile])