[v3] locale cache PR 7076,8761

[Benjamin Kosnik]

>I changed the rules because apparently this was unclear. Unless you do
>the intaglio in linker-map.gnu, new symbols get added under the old
>version name. 

To clarify:

If you do "make check-abi-verbose" it will give you the old deal, a
verbose list of symbols. In that output, look for the new symbol, and
find its version name. If it's GLIBCPP_3.2.0, then you know that it was
added in the old version name == bad news, incompatible. Once you add it
in the most current version name (GLIBCPPP_3.2.4), things will be ok.

-benjamin