Also refactor the function so we pass it the current version
and don't rely on the define inside of it.
This function only allows version format in the style of "x.y.z".
See last commit with comment regarding cons_show().
In this test here we can see that if we pass NULL cons_show() isn't
called. Making it a bit different that other invalid test cases.
Move `p_sha1_hash()` from `common.c` to `xmpp/stanza.c` as it is only
used in this file and now depends on libstrophe so xmpp is a better
namespace folder.
Renaming it as `_stanza_create_sha1_hash()`. And making static since
only used here.
The function cannot be tested in the unit tests anymore.
Once functional tests are working again we should write a test for the
sha1 functionality.
