Fix unit tests - the tests cannot use a common library of production

since when compiling some test code the idea is to stub out production
functionality rather than call production code.

src/test/unit/baro_bmp085_unittest.cc

@@ -182,8 +182,8 @@ TEST(baroBmp085Test, TestBmp085CalculateOss3Hot)
 
 extern "C" {
 
-    void gpioInit(){}
-    void RCC_APB2PeriphClockCmd(){}
+    void gpioInit() {}
+    void RCC_APB2PeriphClockCmd() {}
     void delay(uint32_t) {}
     void delayMicroseconds(uint32_t) {}
     bool i2cWrite(uint8_t, uint8_t, uint8_t) {

src/test/unit/platform.h

@@ -20,6 +20,7 @@
 #define MAG
 #define BARO
 #define GPS
+#define DISPLAY
 #define TELEMETRY
 #define LED_STRIP
 #define USE_SERVOS

src/test/unit/rc_controls_unittest.cc

@@ -693,9 +693,9 @@ void accSetCalibrationCycles(uint16_t) {}
 void gyroSetCalibrationCycles(uint16_t) {}
 void applyAndSaveAccelerometerTrimsDelta(rollAndPitchTrims_t*) {}
 void handleInflightCalibrationStickPosition(void) {}
+bool feature(uint32_t) { return false;}
+bool sensors(uint32_t) { return false;}
 void mwArm(void) {}
-void feature(uint32_t) {}
-void sensors(uint32_t) {}
 void mwDisarm(void) {}
 void displayDisablePageCycling() {}
 void displayEnablePageCycling() {}

src/test/unit/rx_rx_unittest.cc

@@ -139,6 +139,12 @@ extern "C" {
     void failsafeOnValidDataFailed() {}
     void failsafeOnValidDataReceived() {}
 
+    void failsafeOnRxSuspend(uint32_t ) {}
+    void failsafeOnRxResume(void) {}
+
+    uint32_t micros(void) { return 0; }
+    uint32_t millis(void) { return 0; }
+
     bool feature(uint32_t mask) {
         UNUSED(mask);
         return false;
@@ -159,6 +165,4 @@ extern "C" {
     void rxMspInit(rxConfig_t *, rxRuntimeConfig_t *, rcReadRawDataPtr *) {}
 
     void rxPwmInit(rxRuntimeConfig_t *, rcReadRawDataPtr *) {}
-
-
 }