Fixed imports for all files *within* `libc/src/string/memory_utils`.
Note: This doesn't include **all** files that need to be fixed.

Fixes #86579

This prevents a conflict with the Linux system endian.h when built in
overlay mode for CPP files in __support.

This issue appeared in PR #106259.

This is a part of #97655.

Reverts llvm/llvm-project#98075

bots are broken

This is a part of #97655.

Umbrella bug #83182

These templates are made to match the ergonomics of std::numeric_limits.
Because our style for constexpr variables is ALL_CAPS, we must silence the
linter for these manually.

Link:
https://clang.llvm.org/extra/clang-tidy/#suppressing-undesired-diagnostics

Fixes:

    libc/src/string/memory_utils/utils.h:345:13: warning: invalid case style
    for member 'offset_' [readability-identifier-naming]

Having a trailing underscore for members is a google3 style, not LLVM style.
Removing the underscore is insufficient, as we would then have 2 members with
the same identifier which is not allowed (it is a compile time error). Remove
the getter, and just access the renamed member that's now made public.

Found via:

    $ ninja -k2000 libc-lint 2>&1 | grep readability-identifier-naming

Auto fixed via:

    $ clang-tidy -p build/compile_commands.json \
      -checks="-*,readability-identifier-naming" \
      <filename> --fix

This doesn't fix all instances, just the obvious simple cases where it makes
sense to change the identifier names.  Subsequent PRs will fix up the
stragglers.

Codify that we use lower_case for
readability-identifier-naming.ConstexprFunctionCase and then fix the 11
violations (rather than codify UPPER_CASE and have to fix the 170 violations).