Add missing includes

Author: pennam

src/bpid/mac.h

@@ -28,6 +28,8 @@
     #include <Ethernet.h>
     #define IFACE_MAC_ADDR_LENGTH 6
 #else
+    #include <stdint.h>
+    #include <stddef.h>
     #define IFACE_MAC_ADDR_LENGTH 0
 #endif
 

src/bpid/ucid.h

@@ -34,6 +34,8 @@ namespace arduino { namespace ucid {
     }
     #define UC_UID_SIZE FLASH_UNIQUE_ID_SIZE_BYTES
 #else
+    #include <stdint.h>
+    #include <stddef.h>
     #define UC_UID_SIZE 0
 #endif