Don't try to set HAVE_EBP_AVAILABLE on posix x86.
Don't try to set HAVE_EBP_AVAILABLE on posix x86.

https://bugs.chromium.org/p/chromium/issues/detail?id=796379

nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js