05502de64c
Most of the unit tests don't (or don't need to) read/write libc_errno code directly - it's cleared by the ErrnoCheckingTest harness, and is verified by framework-provided scripts such as EXPECT_MATH_ERRNO. Use the following rule of thumb for header inclusion: * if you use libc_errno in code literally, include src/__support/libc_errno.h * if you only rely on errno constants, include hdr/errno_macros.h This PR only updates a few tests for acos/asin variants, as a proof-of-concept. If it goes in, a follow-up PR would update the rest.
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