i18n locale test failing on Arch

On Arch the locale test is currently failing with ERROR:../tests/locale.c:142:test_complete: assertion failed (issues == SRT_LOCALE_ISSUES_NONE): (32 == 0)

This is because the file /usr/share/i18n/SUPPORTED is not available.

This is the relevant snippet of the glibc PKGBUILD:

  sed -e '1,3d' -e 's|/| |g' -e 's|\\| |g' -e 's|^|#|g' \
    "$srcdir/glibc/localedata/SUPPORTED" >> "$pkgdir/etc/locale.gen"