configure.ac: bump to 1.0.0rc4

configure.ac

@@ -16,7 +16,7 @@
 #
 # See the GNU Lesser General Public License in COPYING.LGPL for more details.
 
-AC_INIT([StarPU],1.0.0rc3, [starpu-devel@lists.gforge.inria.fr], starpu)
+AC_INIT([StarPU],1.0.0rc4, [starpu-devel@lists.gforge.inria.fr], starpu)
 AC_CONFIG_SRCDIR(include/starpu.h)
 AC_CONFIG_AUX_DIR([build-aux])