JSCBC-930: Support for AWS AWS Graviton2
JSCBC-930: Support for AWS AWS Graviton2

Add arm64 configuration header for gyp

Change-Id: I3a24997c6846894e1947fa8641af6c76449e4865
Reviewed-on: http://review.couchbase.org/c/couchnode/+/162868
Tested-by: Jake Rawsthorne <dc8633dae52e1ed0cfa121ac37862f478f70275b@couchbase.com>
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

couchbase/couchnode,brett19/couchnode,brett19/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode,couchbase/couchnode