Mark AVX- and SSE-using targets as incompatible with non-x86 platforms.

[lexi-nadia]

No description provided.

[95-martin-orion]

Changes LGTM. I've triggered the Kokoro build to test the C++ build across Linux/Mac/Windows - if there are any odd edge cases that should surface them for us.

[95-martin-orion]

@lexi-nadia the Kokoro logs should be visible from the details link - let me know if you don't have access.

From those logs:

//lib:statespace_avx: no such attribute 'target_compatible_with' in 'cc_library' rule
{ ...similar logs for other rules... }

[95-martin-orion]

Summary of offline discussion: target_compatible_with was not added until bazel v4.0. While the qsim bazel version could plausibly advance (although see #526 for issues around that), it cannot advance past the bazel version used in Tensorflow Quantum, which is 3.7.2.

Instead, these changes will be applied to the pipeline used to construct the Google-internal mirror of qsim.