Replaced strerror() calls with threadsafe strerror_r()

runtime/bin/file_macos.cc

Index: runtime/bin/file_macos.cc
diff --git a/runtime/bin/file_macos.cc b/runtime/bin/file_macos.cc
index 3cf40de61fc5267b8221b07b2669f4a38ebc8249..7b3815aa0feeb8baf3ce9814ac10133911f996a0 100644
--- a/runtime/bin/file_macos.cc
+++ b/runtime/bin/file_macos.cc
@@ -319,7 +319,10 @@ File::StdioHandleType File::GetStdioHandleType(int fd) {
   struct stat buf;
   int result = fstat(fd, &buf);
   if (result == -1) {
-    FATAL2("Failed stat on file descriptor %d: %s", fd, strerror(errno));
+    const int kBufferSize = 1024;
+    char error_message[kBufferSize];
+    strerror_r(errno, error_message, kBufferSize);
+    FATAL2("Failed stat on file descriptor %d: %s", fd, error_message);
   }
   if (S_ISCHR(buf.st_mode)) return kTerminal;
   if (S_ISFIFO(buf.st_mode)) return kPipe;