[libc] [llvm] [libc][c11] Add stdio.h's rename() function (PR #85068)

[Nick Desaulniers via llvm-commits]

================
@@ -11,3 +11,17 @@ add_entrypoint_object(
     libc.src.__support.OSUtil.osutil
     libc.src.errno.errno
 )
+
+add_entrypoint_object(
+  rename
+  SRCS
+    rename.cpp
+  HDRS
+    ../rename.h
+  DEPENDS
+    libc.include.fcntl
+    libc.include.unistd
+    libc.include.sys_syscall
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nickdesaulniers wrote:

sort these (or the whole block)

https://github.com/llvm/llvm-project/pull/85068