[libc] fix -Wmacro-redefined (#75261)
When building with compiler-rt enabled, warnings such as the following
are
observed:
llvm-project/llvm/build/projects/compiler-rt/../libc/include/llvm-libc-macros/linux/sys-stat-macros.h:46:9:
warning: 'S_IXOTH' macro redefined [-Wmacro-redefined]
#define S_IXOTH 00001
^
llvm-project/llvm/build/projects/compiler-rt/../libc/include/llvm-libc-macros/linux/fcntl-macros.h:61:9:
note: previous definition is here
#define S_IXOTH 01
^
It looks like we have these multiply defined. Deduplicate these flags;
users
should expect to find them in sys/stat.h. S_FIFO was wrong anyways
(should
have been S_IFIFO).
