core: parse fline - cast number to char for print to avoid compile wa…

…rning

(cherry picked from commit ccb368e)

src/core/parser/parse_fline.c

@@ -248,7 +248,7 @@ char* parse_first_line(char* buffer, unsigned int len, struct msg_start* fl)
 	if (prn) {
 		for (t=0; t<offset; t++)
 			if (*(buffer+t)) *(prn+t)=*(buffer+t);
-			else *(prn+t)=176; /* '°' */
+			else *(prn+t)=(char)176; /* '°' */
 		LOG(L_DBG, "parsed so far: %.*s\n", offset, ZSW(prn) );
 		pkg_free( prn );
 	};