atom-shell on linux is incorrectly reporting `ia32` for `process.arch`.
This is happening because `-Dtarget_arch=ia32` is passed to ninja on linux inside `script/update.py` which leads to '-DARCH="ia32"' being set in the compile flags. I see that the current intention is to target 64 bit builds on linux (37275c64cd) and the binaries are in fact compiled as 64 bit despite this bug. I guess ninja is somehow smartly ignoring the incorrect setting of the `-m32` flags at 6d772c3cda/common.gypi (L175-L178).
Until this is fixed it breaks usage of any node-pre-gyp packaged node addons because node-pre-gyp depends on process.arch being correct in order to require the right binary arch.
