[libc] Add sys/stat syscall wrappers (#195295) Added ErrorOr-returning syscall wrappers for chmod, fchmod, fchmodat, mkdir, mkdirat, and statx in src/__support/OSUtil/linux/syscall_wrappers/. Migrated the sys/stat Linux entrypoints to use them. Added hdr/types/struct_stat.h proxy header. Updated stat, lstat, fstat to use it, and kernel_statx to use the new statx wrapper. Fixed fchmodat CMakeLists.txt to reference fchmodat.h (was fchmod.h). Updated test dependencies to use hdr/sys_stat_macros.
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