atheme: Update to 7.2.11

Changes since v7.2.10:

    Support building contrib modules on most non-Linux Operating Systems
    Add a preliminary Turkish translation
    Add HMAC-MD5 verify-only support to crypto/pbkdf2v2
    atheme.conf.example: document needoper not being inherited
    modules/chanserv/akick: fix unload crash with akicks that have timeouts
    modules/nickserv/register: check e-mail address validity earlier in the process
    modules/nickserv/multimark: use IRC case canonicalisation for restored nicks
    modules/nickserv/multimark: forbid unloading due to the potential for data loss
    CA_ constants: include CA_EXEMPT (+e) where appropriate
    libathemecore/conf.c: fix minor memory leak with hide_xop

(nia)