unit_test inline implementation and remove module build

src/systemcmds/tests/test_autodeclination.cpp

@@ -1,4 +1,4 @@
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 #include <drivers/drv_hrt.h>
 #include <geo/geo.h>

src/systemcmds/tests/test_conv.cpp

@@ -51,7 +51,7 @@
 #include <math.h>
 #include <float.h>
 
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 #include <px4iofirmware/protocol.h>
 
 int test_conv(int argc, char *argv[])

src/systemcmds/tests/test_float.cpp

@@ -1,4 +1,4 @@
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 #include <px4_config.h>
 #include <cfloat>

src/systemcmds/tests/test_hysteresis.cpp

@@ -1,4 +1,4 @@
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 #include <systemlib/hysteresis/hysteresis.h>
 

src/systemcmds/tests/test_int.cpp

@@ -1,4 +1,4 @@
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 #include <errno.h>
 #include <fcntl.h>

src/systemcmds/tests/test_mathlib.cpp

@@ -31,7 +31,7 @@
  *
  ****************************************************************************/
 
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 #include <errno.h>
 #include <fcntl.h>

src/systemcmds/tests/test_matrix.cpp

@@ -1,5 +1,5 @@
 
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 #include <matrix/math.hpp>
 #include <matrix/filter.hpp>

src/systemcmds/tests/test_mixer.cpp

@@ -64,7 +64,7 @@
 
 #include "tests_main.h"
 
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 static int	mixer_callback(uintptr_t handle,
 			       uint8_t control_group,

src/systemcmds/tests/test_parameters.cpp

@@ -1,4 +1,4 @@
-#include <unit_test/unit_test.h>
+#include <unit_test.h>
 
 class ParameterTest : public UnitTest
 {