Move p_sha1_hash() to stanza.c

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.

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