Log Message:
Update libstrophe to version 0.12.3

profanity 0.14.0 needs this new version.

pkgsrc changes:
remove patch-configure.ac, applied in this version.

changes from changelog:
0.12.3
- Improve TCP-connection establishment (#221)
- Handle case where the server doesn't provide the `bind`
     feature (#224)
- Fix configure script for non-bash shells (#218)
- Parse JID's according to RFC7622 (#219)
- Fix potential memory leak in internal DNS resolver (#219)
- Fix potential memory leaks in `xmpp_conn_set_cafile()` and
    `xmpp_conn_set_capath()` (#219)
- Internal improvements (#219)

0.12.2
- Fix reconnect issues when Stream Management is enabled (#211)
- Fix resolver ... this time for real hopefully (fixup of #200) (#214)
- Fix clearing of password cache on resumed connection (#214)
- Improve detection&implementation of `va_copy` (#213)
- Fix Valgrind CI builds against LibreSSL (#212)
- Fix perf example on platforms where an `rdtsc()` equivalent
     isn't implemented (#212)

0.12.1
- Fix compilation in buildroot (#207)
- Fixes regarding OpenSSL (#208)
- Fix some build steps when builddir != srcdir (#208)
- Allow the user to disable build of examples (#209)
- CI builds against OpenSSL 3 (#206)
- Change the call signature of the following API:
    - xmpp_conn_set_client_cert() - the PKCS#12 file has now to
        be passed via the `cert` parameter. Originally it
        was via `key`. Currently both styles are supported,
        but in a future release only passing via `cert` will be
        accepted.