[MacPorts] #23583: raptor: requires gtk-doc on Tiger; update to 1.4.21

[MacPorts]

#23583: raptor: requires gtk-doc on Tiger; update to 1.4.21
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 Reporter:  ryandesign@…             |       Owner:  lyle@…               
     Type:  defect                   |      Status:  new                  
 Priority:  Normal                   |   Milestone:                       
Component:  ports                    |     Version:  1.8.2                
 Keywords:  haspatch                 |        Port:  raptor               
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 raptor 1.4.19 was built using gtk-doc < 1.12 and therefore uses the
 "which" command in a way that is not compatible with Tiger and earlier,
 and therefore fails to detect when gtk-doc is not installed and tries to
 use it anyway. This was reported on the mailing list. This is
 [https://bugzilla.gnome.org/show_bug.cgi?id=562310 this upstream bug
 report]. The workaround is to fix the usage of "which" so that it is
 compatible with Tiger and earlier (as I did for glib2 in
 [browser:trunk/dports/devel/glib2/files/patch-which.diff?rev=58480 this
 patch]), or just declare a dependency on gtk-doc. When raptor is updated
 to a newer version that is built with gtk-doc >= 1.12 this workaround will
 no longer be necessary. As it happens, raptor 1.4.21 seems to have this
 fix, so we should just update to that version. May I commit the attached
 patch?

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Ticket URL: <http://trac.macports.org/ticket/23583>
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