silence warnings

watch-library/hardware/watch/watch_private.c

@@ -119,7 +119,8 @@ int getentropy(void *buf, size_t buflen) {
     return 0;
 }
 
-void watch_disable_TRNG() {
+void watch_disable_TRNG(void);
+void watch_disable_TRNG(void) {
     // per Microchip datasheet clarification DS80000782,
     // silicon erratum 1.16.1 indicates that the TRNG may leave internal components powered after being disabled.
     // the workaround is to disable the TRNG by clearing the control register, twice.

watch-library/shared/watch/watch_private_buzzer.c

@@ -23,6 +23,7 @@
  */
 #include "driver_init.h"
 
+uint16_t sequence_length(int8_t *sequence);
 uint16_t sequence_length(int8_t *sequence) {
     uint16_t result = 0;