build: Ensure aclocal finds our local macros

The vala bindings commit copied in vapigen.m4, but our autogen.sh
invocation was depending on it being found in the buildroot.  This
ensures autogen.sh will work without vala.

diff --git a/autogen.sh b/autogen.sh
index fad340e..7afd1b3 100755 (executable)
--- a/autogen.sh
+++ b/autogen.sh
@@ -86,7 +86,7 @@ rm -rf autom4te.cache
 # regenerated from their corresponding *.in files by ./configure anyway.
 touch README INSTALL
 
-$ACLOCAL $ACLOCAL_FLAGS || exit $?
+$ACLOCAL -I build/m4 $ACLOCAL_FLAGS || exit $?
 
 libtoolize --force || exit $?
 intltoolize --force --copy || exit $?