Linaro no longer do gcc releases - they're done by Arm now. Update gcc_arm_linux_ext_dep.yaml to fetch the latest ARM gcc release (10.3-2021.07) from their site and fix LinuxGcc5ToolChain.py with the new GCC_ARM_PREFIX. Signed-off-by: Rebecca Cran <rebecca@bsdio.com> Acked-by: Leif Lindholm <leif@nuviainc.com> Acked-by: Liming Gao <gaoliming@byosoft.com.cn> Acked-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Pierre Gondois <Pierre.Gondois@arm.com> Acked-by: Bob Feng <bob.c.feng@intel.com>