699d3bfdba
Added ErrorOr-returning syscall wrappers for mmap, munmap, mprotect, and pkey_mprotect in src/__support/OSUtil/linux/syscall_wrappers/. Migrated the sys/mman Linux entrypoint implementations to use them, following the design in libc/docs/dev/syscall_wrapper_refactor.rst. Removed the shared mprotect_common.h in favour of per-syscall wrapper headers. Added hdr/sys_mman_macros.h proxy header.
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