Update the Makefile.am to the recent changes in tests/opt too

tests/opt/Makefile.am

@@ -15,9 +15,10 @@
 #
 # See the GNU Lesser General Public License in COPYING.LGPL for more details.
 
-AM_CFLAGS = $(HWLOC_CFLAGS) -Wall
+AM_CFLAGS = $(HWLOC_CFLAGS) -Wall $(STARPU_CUDA_CPPFLAGS)
 LIBS = $(top_builddir)/src/libstarpu.la $(HWLOC_LIBS) @LIBS@
 AM_CPPFLAGS = -I$(top_srcdir)/include/ -I$(top_srcdir)/src/
+AM_LDFLAGS = $(STARPU_CUDA_LDFLAGS)
 
 optbindir = $(libdir)/starpu/tests
 optbin_PROGRAMS =