Update openssl-static-sys

This fixes a local build error:
```
Unable to update https://github.com/alexcrichton/openssl-static-sys#b8f2500c

Caused by:
  [4] Revspec 'b8f2500c39932e9d022dcc2590493ab0cc144e2a' not found.
```
It looks like alexcrichton/openssl-static-sys@b8f2500c39932e9d022dcc2590493ab0cc144e2a was rebased to alexcrichton/openssl-static-sys@1a3743ec387b7c460d36bacef99b50f5dd491af7, and the original commit is no longer in any branch so it is not fetched to new clones.