[MacPorts] #44326: msmtp: remove unused configure arg

[MacPorts]

#44326: msmtp: remove unused configure arg
--------------------------+-------------------
 Reporter:  ryandesign@…  |      Owner:  mww@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  msmtp
--------------------------+-------------------
 When configuring msmtp @1.4.32_1:

 {{{
 configure: WARNING: unrecognized options: --enable-gsasl
 }}}

 This suggests this configure arg should be removed.

 `./configure --help` mentions this alternative you could use:

 {{{
   --with-libgsasl         Use GNU SASL authentication library.
 }}}

 However, even without this, msmtp does link with libgsasl.

-- 
Ticket URL: <https://trac.macports.org/ticket/44326>
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