Fix non atsam build.

Add deadzone test

controller/block/block_deadzone.test.ctrl

+trigger {
+	{ "immediate" }
+}
+
+blocks (100.0, 0.0) {
+	{ "deadzone", "deadzone" }
+	
+	{ "test_input_float",  "test_input"  }
+	{ "test_output_float", "test_output" }
+}
+
+links {
+	{ "test_input", "value", "deadzone",    "in",    true }
+	{ "deadzone",   "out",   "test_output", "value", true }
+}
+
+params {
+	{ "deadzone", "deadzone", (float) 0.1 }
+	{ "deadzone", "intercept", (float) 10.0 }
+
+	{ "test_input",  "value", 4, (float) { 0.0, 0.09, -0.09, 10.0 } }
+	{ "test_output", "value", 4, 
+		(float) { 0.0,  0.0,   0.0, 10.0 },
+		(float) { 0.0,  0.0,   0.0, 0.0 }
+	}
+}
+
+set trace_server false

controller/block/build.mk

@@ -112,6 +112,7 @@ CTRL_TESTS += \
 	$(DIR)/block_command_bool.test.output \
 	$(DIR)/block_command_float.test.output \
 	$(DIR)/block_command_uint32.test.output \
+	$(DIR)/block_deadzone.test.output \
 	$(DIR)/block_ex.test.output \
 	$(DIR)/block_gain.test.output \
 	$(DIR)/block_gain_ratio_abs.test.output \

controller/trigger/build.mk

@@ -2,8 +2,12 @@
 TRIGGER_TARGETS := $(LIBDIR)/libtrigger.la
 
 TRIGGERS := \
-	immediate \
+	immediate
+
+ifdef BUILD_SYSTICK
+TRIGGERS += \
 	systick
+endif
 
 ifdef BUILD_PTHREAD
 TRIGGERS += \