Prepare for android builds (#88)

* 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

src/keyhistory.rs

@@ -1,12 +1,11 @@
 use crate::context::Context;
-use crate::types::*;
 
 /* yes: uppercase */
 /* library private: key-history */
 pub fn dc_add_to_keyhistory(
     _context: &Context,
     _rfc724_mid: *const libc::c_char,
-    _sending_time: time_t,
+    _sending_time: u64,
     _addr: *const libc::c_char,
     _fingerprint: *const libc::c_char,
 ) {