ota: define missing prototypes

Author: mcspr

code/espurna/ota_base.h

@@ -1,5 +1,8 @@
 #pragma once
 
+void otaDebugProgress(unsigned int bytes);
+void otaDebugError();
+
 bool otaBegin();
 bool otaWrite(uint8_t* data, size_t len);
 bool otaEnd(size_t size, unsigned char reset_reason = 0);