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The changed tests are symbols-compat, symbols-renames, and
symbols-static. The major benefits are that temporary files
are no longer required, and it’s easier to parse nm output.
This eliminates the last places where we used awk in our own
code (it’s still used in the code generated by the autotools)
so we can remove AC_PROG_AWK from configure.ac.
symbols-compat is taught to use readelf as well as nm, because
Ubuntu Trusty shipped binutils 2.24 (released 2013), and the
‘nm’ in this version doesn’t have the ‘--with-symbol-versions’
option (added circa 2016).
Libtool provides an Autoconf macro that will just _tell_ us
whether global symbols defined in C are prefixed with an
underscore; we don’t need to guess based on $host_os.
Instead of not running test/symbols-renames.pl at all when
cpp -dD is not available, run it and have it exit 77, so it
counts as a skip in the statistics. Also eliminates an
AM_CONDITIONAL.
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