Bug#20616: drop_temp_table test fails on Windows platform

sql/sql_table.cc:
  Check for FN_DEVCHAR in the table name just before file creation. This allows for temporary tables to contain FN_DEVCHAR in the name.
sql/table.cc:
  Removed the check for FN_DEVCHAR is done at this level because it prevents Windows from creating any table with FN_DEVCHAR in the name.

sql/sql_table.cc

@@ -1656,8 +1656,23 @@ bool mysql_create_table(THD *thd,const char *db, const char *table_name,
       my_casedn_str(files_charset_info, path);
     create_info->table_options|=HA_CREATE_DELAY_KEY_WRITE;
   }
-  else
+  else  
+  {
+	#ifdef FN_DEVCHAR
+	  /* check if the table name contains FN_DEVCHAR when defined */
+	  const char *start= alias;
+	  while (*start != '\0')
+	  {
+		  if (*start == FN_DEVCHAR)
+		  {
+			  my_error(ER_WRONG_TABLE_NAME, MYF(0), alias);
+			  DBUG_RETURN(TRUE);
+		  }
+		  start++;
+	  }	  
+	#endif
     build_table_path(path, sizeof(path), db, alias, reg_ext);
+  }
 
   /* Check if table already exists */
   if ((create_info->options & HA_LEX_CREATE_TMP_TABLE)

sql/table.cc

@@ -1614,10 +1614,6 @@ bool check_db_name(char *name)
     if (*name == '/' || *name == '\\' || *name == FN_LIBCHAR ||
 	*name == FN_EXTCHAR)
       return 1;
-#ifdef FN_DEVCHAR
-    if (*name == FN_DEVCHAR)
-      return 1;
-#endif
     name++;
   }
   return last_char_is_space || (uint) (name - start) > NAME_LEN;
@@ -1660,10 +1656,6 @@ bool check_table_name(const char *name, uint length)
 #endif
     if (*name == '/' || *name == '\\' || *name == FN_EXTCHAR)
       return 1;
-#ifdef FN_DEVCHAR
-    if (*name == FN_DEVCHAR)
-      return 1;
-#endif
     name++;
   }
 #if defined(USE_MB) && defined(USE_MB_IDENT)