examples/Makefile.am: remove un-needed automake option subdir-objects

examples/Makefile.am

@@ -22,8 +22,6 @@ LIBS = $(top_builddir)/src/libstarpu-@STARPU_EFFECTIVE_VERSION@.la $(MAGMA_LIBS)
 AM_CPPFLAGS = -I$(top_srcdir)/include/ -I$(top_srcdir)/examples/ -I$(top_builddir)/include
 AM_LDFLAGS = $(STARPU_CUDA_LDFLAGS) $(STARPU_OPENCL_LDFLAGS)
 
-AUTOMAKE_OPTIONS = subdir-objects
-
 SUBDIRS = stencil
 
 BUILT_SOURCES =