www/node: fix build on powerpc64 elfv1

13.2.0 broke powerpc64 elfv1 (again). The problem are those two commits:
https://github.com/nodejs/node/commit/605cb9f0fcd1d334ec15959bb79ba44b0e9f8186
https://github.com/nodejs/node/commit/fe99841c88fdb87959a14c7bca81e4cd4582eba6

They added ifdefs for _AIX, but the code they guard should run on all ppc64 elfv1 (not only on AIX).

Widen those ifdefs appriopriately so that node builds again.

PR: 242404
Approved by: bhughes (maintainer)