mail/fetchmail depends overhaul, new fetchmailconf port

* Bring back SNI (server name indication) support for TLS connections,
  lost in 6.3.26_10 (PORTREVISION=10) as a regression over _9.
  Pointy hat: mandree@
* Drop the X11 option, remove the Python dependency, and create a new
  mail/fetchmailconf slave port/package that installs the fetchmailconf
  configurator. Note that the _DEPENDS of the ports reflects a technical
  dependence (fetchmailconf needs fetchmail), and we cannot keep an
  X11 option that depends on fetchmailconf, since that would create
  a circular dependency, which we must avoid.
* Patch configure instead of configure.ac with Cy's Kerberos fix, drop
  autoreconf from USES, and add a new configure check directly to set
  HAVE_DECL_SSLV3_CLIENT_METHOD to cover the various TLS providers
  (currently five, base, openssl, openssl111, libressl, libressl-devel)
* Add -Wl,--as-needed to LDFLAGS so as not to pull in unneeded .so
  libraries, for instance, libcom_err when compiling under GSSAPI_NONE.
* Bump PORTREVISION.

Very fruitful and nice collaboration with and
Approved by:	chalpin@cs.wisc.edu (maintainer)

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