try macro may have undefined behavior

In CTryCatch.h, the line in the `try` macro ...

```c
if(!(CTRYCATCH_NAME(exception_type) = setjmp(CTRYCATCH_NAME(exception_env))))
```

... may cause undefined behavior, since setjmp's return value can not be used to initialize a variable (see [cppreference](https://en.cppreference.com/w/c/program/setjmp) for more details).