Prevent recursive MSan interceptors in strftime(3) like functions

[krytarowski]

Summary

This corrects intercepting this call on NetBSD without false positives.

Sponsored by <The NetBSD Foundation>

[krytarowski]

ping?

compiler-rt/trunk/lib/msan/msan_interceptors.cc

 }
 #define MSAN_MAYBE_INTERCEPT___STRXFRM_L INTERCEPT_FUNCTION(__strxfrm_l)
 #else
 #define MSAN_MAYBE_INTERCEPT___STRXFRM_L
 #endif
 
 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
   ENSURE_MSAN_INITED();                                              \
+  InterceptorScope interceptor_scope;                                \
   ret_type res = REAL(func)(s, __VA_ARGS__);                         \
   if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1));          \
   return res;
 
 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
             __sanitizer_tm *tm) {
   INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
 }