Avoid potential undesirable effects caused by macros

The macros provided by this library would expand to an unguarded
conditional that could have potential unwanted consequences. Consider
the following example:

    dynstr_append_or_ret_null(&d, "example");
    else
    {
        /* This is unexpectedly working. */
    }

The example above would expand to:

    if (dynstr_append(__VA_ARGS__) != DYNSTR_OK) return false;
    else
    {
        /* This is unexpectedly working. */
    }

Which is valid C yet allows possibly unexpected behaviour. The solution
is then to enclose these conditions into a `do while (0)` statement.

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