Set CFLAGS_powerpc64le_unknown_linux_gnu=-DAT_HWCAP2=26 in CI to work around aws-lc-sys (via rustls) calling getauxval(AT_HWCAP2) on manylinux2014 where glibc 2.17 headers lack AT_HWCAP2; glibc still provides getauxval so the value is safe and only used for ppc64le cc invocations. Also enable the tokio "io-std" feature for the biliup-cli crate to opt into the io-std I/O implementation.