Fix compiler warnings on JIT builds where `-mno-outline-atomics` are not supported.

[savannahostrowski]

See https://github.com/python/cpython/actions/runs/11115927540/job/30887579831?pr=124813#step:6:1063 as an example.

Related to a change I made in https://github.com/python/cpython/pull/124443/files#diff-700c6057d24addce74e8787edb5f5556f718299f6ef1742cbb1d79580cdb535cR144

Linked PRs

• GH-124820: Move -mno-outline-atomics flag to aarch64 Linux JIT builds only #124821
• [3.13] GH-124820: Move -mno-outline-atomics flag to aarch64 Linux JIT builds only (GH-124821) #124883

[vstinner]

See https://github.com/python/cpython/actions/runs/11115927540/job/30887579831?pr=124813#step:6:1063 as an example.

clang: warning: 'x86_64' does not support '-mno-outline-atomics'; flag ignored [-Woption-ignored]
clang: warning: 'x86_64' does not support '-mno-outline-atomics'; flag ignored [-Woption-ignored]
clang: warning: 'x86_64' does not support '-mno-outline-atomics'; flag ignored [-Woption-ignored]
clang: warning: 'x86_64' does not support '-mno-outline-atomics'; flag ignored [-Woption-ignored]