[llvm] [libc] [reland][libc] add epoll_wait functions (PR #79635)

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git-clang-format --diff 59f05239dbbc2c37d9de2bf638a64e1e9abd9163 93b0f08b918c9f89cf692b3ec6c24e51a3899baf -- libc/include/llvm-libc-types/struct_epoll_data.h libc/include/llvm-libc-types/struct_epoll_event.h libc/src/sys/epoll/epoll_pwait.h libc/src/sys/epoll/epoll_pwait2.h libc/src/sys/epoll/epoll_wait.h libc/src/sys/epoll/linux/epoll_pwait.cpp libc/src/sys/epoll/linux/epoll_pwait2.cpp libc/src/sys/epoll/linux/epoll_wait.cpp libc/test/src/sys/epoll/linux/epoll_pwait2_test.cpp libc/test/src/sys/epoll/linux/epoll_pwait_test.cpp libc/test/src/sys/epoll/linux/epoll_wait_test.cpp libc/config/linux/syscall_numbers.h.inc
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View the diff from clang-format here.
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``````````diff
diff --git a/libc/include/llvm-libc-types/struct_epoll_event.h b/libc/include/llvm-libc-types/struct_epoll_event.h
index 997a94a585..edfa026fa9 100644
--- a/libc/include/llvm-libc-types/struct_epoll_event.h
+++ b/libc/include/llvm-libc-types/struct_epoll_event.h
@@ -11,7 +11,7 @@
 
 #include <llvm-libc-types/struct_epoll_data.h>
 
-typedef struct epoll_event{
+typedef struct epoll_event {
   __UINT32_TYPE__ events;
   epoll_data_t data;
 } epoll_event;

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https://github.com/llvm/llvm-project/pull/79635