Add support for redhat_aarch64_gcc482 architecture.

Official AArch64 (ARM64) release by Red Hat is called
"ARM64 release 1 (ARM64)" and is a remix of 64-bit ARM (aarch64)
based on Fedora. Latest rootfs already contains this rebranding.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
gcc: update binutils (2.24) and elfutils (0.158)

These following releases adds AArch64 support.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>