[Pidgin] #14957: Drop unnecessary MAKENSISOP for simpler build

[Pidgin]

#14957: Drop unnecessary MAKENSISOP for simpler build
------------------------+---------------------------------------------------
Reporter:  renatosilva  |        Type:  patch             
  Status:  new          |   Component:  libpurple         
 Version:  2.10.1       |    Keywords:  windows build nsis
------------------------+---------------------------------------------------
 This patch eliminates MAKENSISOP from Windows Pidgin build since
 makensis.exe does support dashed arguments:

 {{{
 $ makensis.exe -V3 -Dfoo=bar does_work.nsi
 }}}

 [[Image(http://i.imgur.com/9hlHP.png)]]

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Ticket URL: <http://developer.pidgin.im/ticket/14957>
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