[RFC] Update minimum make version to 3.81

[Paul E. Murphy]

On 06/10/2016 06:25 PM, Joseph Myers wrote:
> On Fri, 10 Jun 2016, Mike Frysinger wrote:
> 
>> On 10 Jun 2016 15:27, Roland McGrath wrote:
>>> eval is a pretty horrible feature and I'd probably object to introducing
>>> any uses of it into libc's makefiles.  We already have lots of things that
>>> might have been done that way, but are instead done with generated makefiles.
>>
>> while i agree, i still think we should raise the min make ver.
>> practically speaking, no one is testing 3.79 or 3.80.
>>
>> i wouldn't mind 3.82 myself -- that's 2010.  our gcc & binutils
>> requirements are more recent than that.
> 
> It took a long time for GNU/Linux distributors to move on from 3.81.  For 
> example, Ubuntu 14.04 uses 3.81.
> 

With a little more elbow grease, I no longer have reason to
raise this requirement.

Are there any other compelling reasons to pursue a bump?