[Pidgin] #1801: Adding make target to build documentation to Makefile.mingw

[Pidgin]

#1801: Adding make target to build documentation to Makefile.mingw
-------------------+--------------------------------------------------------
Reporter:  jconti  |       Owner:  datallah            
    Type:  patch   |      Status:  new                 
Priority:  minor   |   Component:  winpidgin (gtk)     
 Version:  2.0.2   |    Keywords:  win32, documentation
 Pending:  0       |  
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 Since doxygen is available in the cygwin repos, I added a make target to
 Makefile.mingw to build the html documentation. It uses sed to replace the
 package name, version, top directory, and enable dot in Doxyfile.in and
 then builds the docs.

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Ticket URL: <http://developer.pidgin.im/ticket/1801>
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