[Pidgin] #15010: Remove the "Attention!" button when it's not supported.

[Pidgin]

#15010: Remove the "Attention!" button when it's not supported.
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 Reporter:  pazpaz        |     Owner:  rekkanoryo
     Type:  enhancement   |    Status:  new       
Component:  unclassified  |   Version:  2.10.2    
 Keywords:                |  
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 Remove the "Attention!" button where it's not supported. It's grayed out
 for IRC and AIM (and maybe others?) and it's just taking up space.

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Ticket URL: <http://developer.pidgin.im/ticket/15010>
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