skip fxt tests when fxt is not enabled

examples/Makefile.am

@@ -162,9 +162,11 @@ if !STARPU_USE_MPI_MASTER_SLAVE
 SHELL_TESTS			+=	scheduler/schedulers.sh
 SHELL_TESTS			+=	scheduler/schedulers_context.sh
 if !STARPU_NO_BLAS_LIB
+if STARPU_USE_FXT
 SHELL_TESTS			+=	mult/sgemm.sh
 endif
 endif
+endif
 
 check_PROGRAMS		=	$(STARPU_EXAMPLES)
 noinst_PROGRAMS		=

tests/Makefile.am

@@ -458,9 +458,13 @@ endif
 if !STARPU_USE_MPI_MASTER_SLAVE
 SHELL_TESTS += \
 	datawizard/locality.sh \
-	microbenchs/bandwidth_scheds.sh \
+	microbenchs/bandwidth_scheds.sh
+
+if STARPU_USE_FXT
+SHELL_TESTS += \
 	overlap/overlap.sh
 endif
+endif
 
 ################################
 # Simgrid Model Checking tests #