RFR: 8275449: Add linux-aarch64-zero build profile

[Magnus Ihse Bursie]

On Wed, 20 Oct 2021 00:10:14 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Please review this small change that adds the linux-aarch64 zero build profile.
>
> make/autoconf/lib-ffi.m4 line 152:
> 
>> 150:             AC_MSG_ERROR([Could not locate libffi.so.? for bundling])
>> 151:           fi
>> 152:         elif ((test "x${OPENJDK_TARGET_CPU}" = "xx86_64") || (test "x${OPENJDK_TARGET_CPU}" = "xaarch64")); then
> 
> Using parens like this in shell isn't wrong, but it's not a pattern we commonly use in these files.

I might add that each layer of () spawns a new subshell, which is noticably slow on cygwin. So please remove them.

-------------

PR: https://git.openjdk.java.net/jdk/pull/6024