[MacPorts] #29632: avr-libc: update to 1.7.1

[MacPorts]

#29632: avr-libc: update to 1.7.1
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 Reporter:  tvb377@…             |       Owner:  macports-tickets@…                   
     Type:  update               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  1.9.2                                
 Keywords:  haspatch maintainer  |        Port:  avr-libc                             
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 This patch updates avr-libc's Portfile to install 1.7.1

 Also: corrected whitespace indentation, corrected maintainer name, added
 livecheck, use redirected-to download URL, dropped MD5 chksum.

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Ticket URL: <https://trac.macports.org/ticket/29632>
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