Cleanup for getgrouplist(3):  - Use /*- instead of /* for copyright section  - Include unistd.h for prototype of it  - Sort and separate includes as described in style(9)  - ANSIfy the function defination  - Use const for the traversing iterator
Cleanup for getgrouplist(3):
 - Use /*- instead of /* for copyright section
 - Include unistd.h for prototype of it
 - Sort and separate includes as described in style(9)
 - ANSIfy the function defination
 - Use const for the traversing iterator

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