Should be sufficient to set CONFIG_SITE to /dev/null before running configure to
prevent any config site file to be loaded, which currently causes non-determinism in builds.
Setting the variable CONFIG_SITE prevents configure files to check $prefix/share/config.site,
$prefix/etc/config.site, $ac_default_prefix/share/config.site, $ac_default_prefix/etc/config.site
so we don't have to patch a block of code.
daba1a805e