[MacPorts] #29123: AntTweakBar: dylib has wrong install_name

[MacPorts]

#29123: AntTweakBar: dylib has wrong install_name
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  karcaw@…        
     Type:  defect                   |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  1.9.2           
 Keywords:                           |        Port:  AntTweakBar     
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 The dylib installed by AntTweakBar has a slightly wrong install_name:

 {{{
 $ port contents AntTweakBar
 Port AntTweakBar contains:
   /opt/local/include/AntTweakBar.h
   /opt/local/lib/libAntTweakBar.dylib
 $ otool -L /opt/local/lib/libAntTweakBar.dylib
 /opt/local/lib/libAntTweakBar.dylib:
         //opt/local/lib/libAntTweakBar.dylib (compatibility version 0.0.0,
 current version 0.0.0)
         /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
 (compatibility version 1.0.0, current version 1.0.0)
         /System/Library/Frameworks/GLUT.framework/Versions/A/GLUT
 (compatibility version 1.0.0, current version 1.0.0)
         /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
 (compatibility version 45.0.0, current version 1038.35.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 125.2.10)
         /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current
 version 227.0.0)
 /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
 (compatibility version 150.0.0, current version 550.42.0)
 /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
 (compatibility version 300.0.0, current version 751.53.0)
 }}}

 Note how its name begins with two slashes. The attached patch fixes this.
 May I commit it?

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Ticket URL: <https://trac.macports.org/ticket/29123>
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