FYI, git gc'd glibc.git: 140MiB -> 82MiB

[Jim Meyering]

I noticed that updating an old clone was taking too long,
and checked the server:

    sourceware$ cd /git/glibc.git && git count-objects
    2869 objects, 39880 kilobytes

That's way too many unpacked objects.
Simply running "git gc" reduced the size of the repository
from 140MiB to 82MiB.

That also has the nice side effect of reducing the cost of
many day-to-day server-side operations.