Fix alignment of 64-bit ints on x86 QNX 7.0 #2
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Preliminary PR before sending to the main repo.
In testing libc and std rust on x86 QNX Neutrino 7.0, I found that the data layout I had used previously had an error - on 32-bit x86, the nto/gcc toolchain aligns 64-bit integer types to 64 bits, which is different from Rust's assumed default of 32-bit alignment.
Separating this from the rest of my 7.0 std work because it is a bug in the already merged no_std support.