[clang-tidy] Prevent `llvmlibc-inline-function-decl` triggering on lambdas

The `llvmlibc-inline-function-decl` check is intended to be used to
allow declarations in the `libc` project's header to be changed per-TU.
However, it is impossible to place this macro in front of a lambda so
this is not helpful. Additionally, lambdas are always going to have
internal linkage so they will not differ accross TUs.

Fixes https://github.com/llvm/llvm-project/issues/62147

Reviewed By: lntue, PiotrZSL

Differential Revision: https://reviews.llvm.org/D148444