bump linkmap versions?

[Benjamin Kosnik]

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As the SONAME changed, you should start from scratch, ie. put all
symbols into
GLIBCPP_3.2 { ... }
and
CXXABI_1.2 { ... }
(if glibc for some reason decided someday that it will bump SONAME,
it would definitely kill all the compatibility cruft and start
at GLIBC_3.0 or whatever that would be - the configury is already
ready for that (for new architectures now)).

But RSN on mainline GLIBCPP_3.3 {} version should be added and
some automated process (in the regression tester) should be checking
the exported symbols (and new ones should be always added to the
new version).

	Jakub