Added prototype for intel hex writing to flash.

Author: fnoble

src/intel_hex.h

@@ -40,5 +40,6 @@ uint16_t hex16(char s[]);
 
 uint8_t ihx_check_line(char line[]);
 void ihx_readline(char line[]);
+void ihx_write(char line[]);
 
 #endif // _INTEL_HEX_H_