[Varnish] #852: need to define NO_VIZ for platforms without visibility attribute support

[Varnish]

#852: need to define NO_VIZ for platforms without visibility attribute support
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 Reporter:  slink   |        Owner:  thfeen
     Type:  defect  |       Status:  closed
 Priority:  normal  |    Milestone:        
Component:  build   |      Version:  trunk 
 Severity:  normal  |   Resolution:  fixed 
 Keywords:          |  
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Changes (by Tollef Fog Heen <tfheen@…>):

  * status:  new => closed
  * resolution:  => fixed


Comment:

 (In [a776169645967061d22ed87bf26236ca6d6f9488]) Check for
 __attribute__((visibility)) support

 The solaris compiler does not support the GNU C extension
 __attribute__((visibility("hidden"))), leading to build failures.
 This commit adds a check for that support and defines NO_VIZ if it's
 visibility setting is not supported.

 Fixes #852

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Ticket URL: </ticket/852#comment:2>
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