[libc] Add baremetal minor archive support. (#203015) This adds support for building a minor LLVM libc archive on baremetal targets, such as libllvmstring.a, from only the entrypoints under a requested libc subdirectory. When ENABLE_LLVM_LIBC_MINOR_VARIANT is enabled, the libc archive build now: 1. Requires LLVM_LIBC_SUBARCHIVE_NAME to be set. 3. Selects only entrypoints matching that subarchive name, for example libc.src.<name>.*. 4. Builds and installs an archive using the requested name. 5. Avoids installing startup objects for minor archive builds. This lets a minor variant provide only one category of libc routines instead of duplicating a full libc.a. Assisted-by: codex, reviewed and cross checked, also tested with ATfE(Arm Toolchain for Embedded), by me.
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