Resolve warning: deprecated conversion from string constant to æchar*Æ

src/sbbs3/userdat.c

@@ -2570,8 +2570,8 @@ BOOL DLLCALL is_download_free(scfg_t* cfg, uint dirnum, user_t* user, client_t*
 /* Add an IP address (with comment) to the IP filter/trashcan file			*/
 /* ToDo: Move somewhere more appropriate (filter.c?)						*/
 /****************************************************************************/
-BOOL DLLCALL filter_ip(scfg_t* cfg, char* prot, char* reason, char* host
-					   ,char* ip_addr, char* username, char* fname)
+BOOL DLLCALL filter_ip(scfg_t* cfg, const char* prot, const char* reason, const char* host
+					   ,const char* ip_addr, const char* username, const char* fname)
 {
 	char	ip_can[MAX_PATH+1];
 	char	tstr[64];

src/sbbs3/userdat.h

@@ -112,7 +112,8 @@ DLLEXPORT BOOL	DLLCALL can_user_read_sub(scfg_t* cfg, uint subnum, user_t* user,
 DLLEXPORT BOOL	DLLCALL can_user_post(scfg_t* cfg, uint subnum, user_t* user, client_t* client, uint* reason);
 DLLEXPORT BOOL	DLLCALL is_user_subop(scfg_t* cfg, uint subnum, user_t* user, client_t* client);
 DLLEXPORT BOOL	DLLCALL is_download_free(scfg_t* cfg, uint dirnum, user_t* user, client_t* client);
-DLLEXPORT BOOL	DLLCALL filter_ip(scfg_t* cfg, char* prot, char* reason, char* host, char* ip_addr, char* username, char* fname);
+DLLEXPORT BOOL	DLLCALL filter_ip(scfg_t* cfg, const char* prot, const char* reason, const char* host
+								  ,const char* ip_addr, const char* username, const char* fname);
 
 /* New atomic numeric user field adjustment functions: */
 DLLEXPORT BOOL	DLLCALL user_posted_msg(scfg_t* cfg, user_t* user, int count);