Update abicheck to require newer libstdc++.so.6
We should update projects/firefox/abicheck.cc
to use features only provided by more recent versions of libstdc++.so.6
.
Currently it only requires GLIBCXX_3.4.22
:
$ strings tor-browser_en-US/Browser/abicheck | grep GLIBCXX_
GLIBCXX_3.4
GLIBCXX_3.4.22
GLIBCXX_3.4.21