[libc] Fix hdrgen output for no-argument functions (#123245)

The hdrgen output is C, not C++.

[libc] Remove unnecessary subdirectory layers in utils/hdrgen (#121363)

Two extra layers of subdirectory for a handful of single-symbol
Python source files did not improve anything, and it complicat

[libc] Remove unnecessary subdirectory layers in utils/hdrgen (#121363)

Two extra layers of subdirectory for a handful of single-symbol
Python source files did not improve anything, and it complicated
integration of the hdrgen Python outside the LLVM CMake build.

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