fix wrong strcpy usage (#4331, patch by Andreas Bierfert)

code/botlib/l_script.c

@@ -1118,7 +1118,7 @@ void StripDoubleQuotes(char *string)
 {
 	if (*string == '\"')
 	{
-		strcpy(string, string+1);
+		memmove(string, string+1, strlen(string));
 	} //end if
 	if (string[strlen(string)-1] == '\"')
 	{
@@ -1135,7 +1135,7 @@ void StripSingleQuotes(char *string)
 {
 	if (*string == '\'')
 	{
-		strcpy(string, string+1);
+		memmove(string, string+1, strlen(string));
 	} //end if
 	if (string[strlen(string)-1] == '\'')
 	{