[OE-core] [PATCH] libc6: improve reproducibility

[Bystricky, Juro]

> Hi Juro,
> 
> Can you put a comment alongside the touch in the recipe as we're not
> going to know why we're doing this in a few years time...
> 

Sure, no problem. I will send v2. BTW, this was fixed in upstream glibc, so the "touch" line can be removed once we upgrade glibc. I will put this in the comment as well. (We still depend on bison-native)