add missing extern C (raspberrypi#2284)

Author: kilograham

src/rp2_common/hardware_boot_lock/include/hardware/boot_lock.h

@@ -9,6 +9,10 @@
 
 #include "pico.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // PICO_CONFIG: PARAM_ASSERTIONS_ENABLED_HARDWARE_BOOT_LOCK, Enable/disable assertions in the hardware_boot_lock module, type=bool, default=0, group=hardware_boot_lock
 #ifndef PARAM_ASSERTIONS_ENABLED_HARDWARE_BOOT_LOCK
 #define PARAM_ASSERTIONS_ENABLED_HARDWARE_BOOT_LOCK 0
@@ -141,4 +145,9 @@ boot_lock_t *boot_lock_init(uint lock_num);
 void boot_locks_reset(void);
 
 #endif
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/rp2_common/hardware_powman/include/hardware/powman.h

@@ -10,6 +10,10 @@
 #include "pico.h"
 #include "hardware/structs/powman.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** \file hardware/powman.h
  *  \defgroup hardware_powman hardware_powman
  *
@@ -272,4 +276,8 @@ static inline void powman_set_debug_power_request_ignored(bool ignored) {
         powman_clear_bits(&powman_hw->dbg_pwrcfg, 0);
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif