Fix declarations and types conversions to build with -Werror

--- ./encode.c
+++ ./encode.c
@@ -15,7 +15,7 @@
 
 const char urlencstring[16] = "0123456789abcdef";
 
-char *urlencode(char *dest, char *source)
+unsigned char *urlencode(unsigned char *dest, unsigned char *source)
 {
 	unsigned char *p, *q;
 	int digit;
@@ -47,7 +47,7 @@ char *urlencode(char *dest, char *source)
  *
  */
 
-char *urlnencode(char *dest, char *source, size_t length)
+unsigned char *urlnencode(unsigned char *dest, unsigned char *source, size_t length)
 {
 	unsigned char *p, *q;
 	int digit;
--- ./encode.h
+++ ./encode.h
@@ -6,8 +6,8 @@
 #ifndef __LIBSHOUT_ENCODE_H
 #define __LIBSHOUT_ENCODE_H
 
-char *urlencode(char *dest, char *source);
-char *urlnencode(char *dest, char *source, size_t length);
+unsigned char *urlencode(unsigned char *dest, unsigned char *source);
+unsigned char *urlnencode(unsigned char *dest, unsigned char *source, size_t length);
 
 #endif  /* __LIBSHOUT_ENCODE_H */
 
--- ./shout.c
+++ ./shout.c
@@ -19,6 +19,7 @@
 #include "sock.h"
 #include "timing.h"
 #include "mp3.h"
+#include "encode.h"
 
 /*
  *	INTERNAL PROTOTYPES
@@ -278,10 +279,10 @@ void shout_sleep(shout_conn_t *self)
 	}
 }
 
-int shout_update_metadata(shout_conn_t *self, char *metadata)
+int shout_update_metadata(shout_conn_t *self, unsigned char *metadata)
 {
 	int s, res;
-	char *metatemp;
+	unsigned char *metatemp;
 
 	/* sanity check */
 	if ((self->ip == NULL) || (self->password == NULL) ||  (self->port <= 0) || !self->connected) {
@@ -295,7 +296,7 @@ int shout_update_metadata(shout_conn_t *self, char *metadata)
 		return 0;
 	}
 
-	metatemp = (char *)malloc(strlen(metadata) * 3 + 1);
+	metatemp = (unsigned char *)malloc(strlen((char *)metadata) * 3 + 1);
 	if (metatemp == NULL) {
 		sock_close(s);
 		self->error = SHOUTERR_MALLOC;
--- ./shout.h
+++ ./shout.h
@@ -93,7 +93,7 @@ void shout_sleep(shout_conn_t *self);
 **
 ** the metadata info for the stream.  meta is in block format
 */
-int shout_update_metadata(shout_conn_t *self, char *metadata);
+int shout_update_metadata(shout_conn_t *self, unsigned char *metadata);
 
 /*
 ** shout_strerror
--- ./sock.c
+++ ./sock.c
@@ -63,10 +63,6 @@
 #include <winsock.h>
 #endif
 
-#ifndef HAVE_SOCKLEN_T
-#define socklen_t int
-#endif
-
 #ifndef _WIN32
 extern int h_errno, errno;
 #endif
--- ./sock.h
+++ ./sock.h
@@ -34,7 +34,9 @@ typedef int SOCKET;
 #endif
 
 #define SOCK_BLOCK 0
+#ifndef SOCK_NONBLOCK
 #define SOCK_NONBLOCK 1
+#endif
 
 /* sock connect macro */
 #define sock_connect(h, p) sock_connect_wto(h, p, 0)