[libc] Mutex implementation for single-threaded baremetal (#145358) Part of https://github.com/llvm/llvm-project/issues/145349. Required to allow `atexit` to work. As part of `HermeticTestUtils.cpp`, there is a reference to `atexit()`, which eventually instantiates an instance of a Mutex. Instead of copying the implementation from `libc/src/__support/threads/gpu/mutex.h`, we allow platforms to select an implementation based on configurations, allowing the GPU and single-threaded baremetal platforms to share an implementation. This can be configured or overridden. Later, when the threading API is more complete, we can add an option to support multithreading (or set it as the default), but having single-threading (in tandem) is in line with other libraries for embedded devices.
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