This test removes the __libc_start_main@GLIBC_2.34 symbol, which should
be the only GLIBC_2.34 symbol in 'main' when built with recent (i.e., >
2.34) glibc. Because it is the only symbol, the entry in .gnu.version_r
should also be removed.
Because this is a symbol version test, it's unlikely to work on musl or
anything else which doesn't use glibc symbol versions. In these cases
(or in the case that __libc_start_main is now at a different version),
the test should print a warning, but exit with "0" to report a pass.
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