bug#12116: merge from gnulib for extern-inline

[Eli Zaretskii]

> Date: Thu, 02 Aug 2012 14:20:13 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: 12116@debbugs.gnu.org, lekktu@gmail.com
> 
> On 08/02/2012 12:49 PM, Eli Zaretskii wrote:
> > what's the story with the addition of stat-time.c,
> > utimespec.c, and u64.c, which just include the respective headers?
> > Where and how are these used, and for what purposes?
> 
> These .c files instantiate the inline functions defined in
> their respective headers, by declaring them to be extern inline.
> Without these .c files, if a compiler decides not to inline one
> of those functions when compiling some other module, there might
> not be any code that actually implements the function.

Thanks.