[llvm] [BinaryFormat] Disable MachOTest.UnalignedLC on SPARC (PR #100086)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

llvm/include/llvm/ADT/bit.h provides define `BYTE_ORDER` and `BIG_ENDIAN` on all targets.

https://github.com/llvm/llvm-project/pull/100086