[libc] Fix wrapper headers for at_quick_exit on GLIBC for C++11 (#166960)

Eliminate compilation error related to missing exception specification
'noexcept(true)' for at_quick_exit function in C++11.

Author: DominikAdamski

clang/lib/Headers/llvm_libc_wrappers/stdlib.h

@@ -34,13 +34,13 @@ _Static_assert(__builtin_offsetof(div_t, quot) == 0, "ABI mismatch!");
 _Static_assert(__builtin_offsetof(ldiv_t, quot) == 0, "ABI mismatch!");
 _Static_assert(__builtin_offsetof(lldiv_t, quot) == 0, "ABI mismatch!");
 
-#if defined(__GLIBC__) && __cplusplus >= 201703L
+#if defined(__GLIBC__) && __cplusplus >= 201103L
 #define at_quick_exit atexit
 #endif
 
 #include <llvm-libc-decls/stdlib.h>
 
-#if defined(__GLIBC__) && __cplusplus >= 201703L
+#if defined(__GLIBC__) && __cplusplus >= 201103L
 #undef at_quick_exit
 #endif