The C API allows passing a NULL pointer is for the callback function.
However when calling the callback nothing checks for this null pointer
and thus things fail badly. Even worse since the C API is defined
using an "fn pointer" rather than a "*-ptr" or raw pointer to the
function rust does not realise this can be invalid and therefore the
typechecker does not catch this even though there are no unsafe casts.
Fix this by making the callback an Option in rust, this can be easily
checked when calling. Also add a Context.call_cb() function which
simplifies calling the callback, hides the weird syntax due to the
function pointer and makes the call a little easier. Finally it also
means the option checking is only needed in one place.
For the C API this needs to check if this is a NULL pointer or not,
this is implicitly done by rust using the "nullable pointer
optimisation":
https://doc.rust-lang.org/nomicon/ffi.html#the-nullable-pointer-optimization
* upgrade ci
* fixup
* update ci script
* Update run.sh
* refactor(time): drop libc time functions
* fix(ffi): use i64 instead off time_t
* fix(ci): install croos
* fix: remove unused dc_check_password
* fix(ffi): enable ssl vendoring by default
* chore: remove unused import
* fix(deps): add vendored flag for reqwest
* chore(ci): use cross fork
* fix: handle invalid server configurations
Closes#90
* Disable android from circle ci for now
