[MacPorts] #54356: expat @2.2.0: security update to version 2.2.1

[MacPorts]

#54356: expat @2.2.0: security update to version 2.2.1
-------------------------+------------------------
 Reporter:  Schamschula  |      Owner:  ryandesign
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  hapatch      |       Port:  expat
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 expat has been updated to version 2.2.1.

 See: https://github.com/libexpat/libexpat/blob/R_2_2_1/expat/Changes

 and https://libexpat.github.io/doc/cve-2017-9233/

 Unfortunately, there is a build error due to a name space conflict. The
 attached patch resolves this by renaming the variable {{{buffer}}} to
 {{{xbuffer}}}.

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Ticket URL: <https://trac.macports.org/ticket/54356>
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