ntdll: Fix building for arm64 without HWCAP_CPUID defined.
This define was added in the linux kernel in
77c97b4ee21290f5f083173d957843b615abbff2 in 2017, available since
kernel headers v4.11 and newer.
ntdll: Fix building for arm64 without ESR_MAGIC/esr_context.
This define and accompanying structure was added in
linux kernel 15af1942dd61ee236a48b3de14d6f31c0b9e8116 in 2013,
available since kernel headers v3.16.