fix toy source code

Recent compilers (e.g. the default `gcc` on OS X 10.9) complains about a faulty main function signature in the toy example:

```
$ gcc toy.c 
toy.c:3:5: error: second parameter of 'main' (argument array) must be of type 'char **'
int main(int argc, char* *argv[]){
    ^
1 error generated.
```

fixed by applying the following patch:

```diff
--- toy-0.0/toy.source.orig	2014-03-06 18:53:40.000000000 +0100
+++ toy-0.0/toy.source	2014-03-06 18:48:16.000000000 +0100
@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-int main(int argc, char* *argv[]){
+int main(int argc, char* argv[]){
 
     printf("I'm a toy, and proud of it.\n");
     return 0;
```