Fix build relating to inverter/pwm rssi compiler errors.

src/main/drivers/inverter.c

@@ -20,13 +20,14 @@
 
 #include "platform.h"
 
+#ifdef INVERTER
+
 #include "gpio.h"
 
 #include "inverter.h"
 
 void initInverter(void)
 {
-#ifdef INVERTER
     struct {
         GPIO_TypeDef *gpio;
         gpio_config_t cfg;
@@ -38,6 +39,6 @@ void initInverter(void)
     RCC_APB2PeriphClockCmd(INVERTER_PERIPHERAL, ENABLE);
 
     gpioInit(gpio_setup.gpio, &gpio_setup.cfg);
+}
 
 #endif
-}

src/main/drivers/pwm_rssi.c

@@ -22,6 +22,8 @@
 
 #include "platform.h"
 
+#include "build_config.h"
+
 #include "gpio.h"
 #include "timer.h"
 

src/main/drivers/system.c

@@ -113,7 +113,9 @@ void systemInit(bool overclock)
 
     ledInit();
     beeperInit();
+#ifdef INVERTER
     initInverter();
+#endif
 
     // Init cycle counter
     cycleCounterInit();