Fixed win32 compilation warnings

mysys/my_redel.c

@@ -76,7 +76,9 @@ end:
 int my_copystat(const char *from, const char *to, int MyFlags)
 {
   struct stat statbuf;
+#if !defined(__WIN__) && !defined(__NETWARE__)
   int res;
+#endif
 
   if (stat((char*) from, &statbuf))
   {

sql/sql_table.cc

@@ -117,7 +117,7 @@ static char* add_identifier(char *to_p, const char * end_p,
         *(to_p++)= '`';
         *(to_p++)= *(conv_name++);
       }
-      else if (length < (end_p - to_p))
+      else if (((long) length) < (end_p - to_p))
       {
         to_p= strnmov(to_p, conv_name, length);
         conv_name+= length;