build: fix use of strict aliasing

The -fno-strict-aliasing flag was added to fix compilation warnings when
building Node.js with GCC <= 4.4

Reviewed-By: Julien Gilli <julien.gilli@joyent.com>
PR-URL: https://github.com/joyent/node/pull/9179

PR: #25141
PR-URL: https://github.com/joyent/node/pull/25141


Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Julien Gilli <jgilli@fastmail.fm>