[roll] Roll fuchsia [superproject] Roll llvm-project/libc [libc] Add osutils for Windows and make libc and its tests build on Windows target (#104676)

This PR first adds osutils for Windows, and changes some libc code to
make libc and its tests build on the Windows target. It then temporarily
disables some libc tests that are currently problematic on Windows.

Specifically, the changes besides the addition of osutils include:

- Macro `LIBC_TYPES_HAS_FLOAT16` is disabled on Windows. `clang-cl`
generates calls to functions in `compiler-rt` to handle float16
arithmetic and these functions are currently not linked in on Windows.
- Macro `LIBC_TYPES_HAS_INT128` is disabled on Windows.
- The invocation to `::aligned_malloc` is changed to an invocation to
`::_aligned_malloc`.
- The following unit tests are temporarily disabled because they
currently fail on Windows:
  - `test.src.__support.big_int_test`
  - `test.src.__support.arg_list_test`
  - `test.src.fenv.getenv_and_setenv_test`
- Tests involving `__m128i`, `__m256i`, and `__m512i` in
`test.src.string.memory_utils.op_tests.cpp`
- `test_range_errors` in `libc/test/src/math/smoke/AddTest.h` and
`libc/test/src/math/smoke/SubTest.h`

GitOrigin-RevId: f8bdcaf0c0a15d9e398cd54fe2b45cb204f9dc7c
Original-Revision: ba0c2fdc45e4b1f04770e2737eec8d8f19987bbf
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1117584
Original-Revision: d66a815c256e3d6c27b09b2b0f7a7d3e0491d683
Change-Id: I52b2f7e915f2decbd23d13821df5464bd39df159