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311f42bbac
Replace the pipe() macro definition with a proper function implementation to improve POSIX compliance and debugging capabilities. The new pipe() function serves as a wrapper around pipe2() with flags set to 0. Changes include: - Convert pipe() from macro to function declaration in unistd.h - Add lib_pipe.c implementation file with proper function documentation - Update build system files (CMakeLists.txt and Make.defs) to include the new source file when CONFIG_PIPES is enabled - Add pipe() entry to libc.csv for symbol tracking This change allows for better debugging, proper symbol resolution, and follows NuttX coding standards for library function implementations. Signed-off-by: Huang Qi <huangqi3@xiaomi.com>