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a6643f27ec
This replaces detection of picolibc in libc++ (by checking for and including picolibc.h) with using RUNTIMES_USE_LIBC build time option intriduced in https://github.com/llvm/llvm-project/pull/134893 RUNTIMES_USE_LIBC is extended to accept picolibc and newlib. Detection of picolibc via the header is kept as a deprecated feature to avoid breaking builds. libc++ is updated to use dedicated LIBCXX_LIBC_NEWLIB macro to check for newlib specific conditions instead of less informative _NEWLIB_VERSION --------- Co-authored-by: Louis Dionne <ldionne.2@gmail.com>