fix these errors:
- ca-certificates missed
fatal: unable to access
'https://github.com/shadowsocks/shadowsocks-libev.git/': Problem with
the SSL CA cert (path? access rights?)
- automake missed
Can't exec "aclocal": No such file or directory at
/usr/share/autoconf/Autom4te/FileUtils.pm line 326.
autoreconf: failed to run aclocal: No such file or directory
- libmbedtls-dev
checking for mbedtls_cipher_setup in -lmbedcrypto... no
configure: error: mbed TLS libraries not found.