Eliminate need for -fno-strict-aliasing in lock_free_queue.h

[graydon]

As per fixme.

[brson]

We don't even turn on -fno-strict-aliasing - the line in platform.mk that tries to do it has a typo - nor do we use lock_free_queue or know it to be unbroken. It should probably just be deleted.

[brson]

Done.