[libc][math] Disable `FEnvSafeTest.cpp` if AArch64 target has no FP support (#166370) The `FEnvSafeTest.cpp` test fails on AArch64 soft nofp configurations because LLVM libc does not provide a floating-point environment in these configurations. This patch adds another preprocessor guard on `__ARM_FP` to disable the test on those.
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