Avoid strerror_r portability issues

runtime/vm/os_thread_linux.cc

Index: runtime/vm/os_thread_linux.cc
diff --git a/runtime/vm/os_thread_linux.cc b/runtime/vm/os_thread_linux.cc
index f48b6b015ea59c36c2f334aed091bb0e3893a454..caa64a630c20ddf1635672df0e2d28f55f7b7ffd 100644
--- a/runtime/vm/os_thread_linux.cc
+++ b/runtime/vm/os_thread_linux.cc
@@ -13,27 +13,16 @@
 #include <sys/time.h>  // NOLINT
 
 #include "platform/assert.h"
+#include "platform/utils.h"
 
 namespace dart {
 
-static char* strerror_helper(int err, char* buffer, size_t bufsize) {
-#if !defined(__GLIBC__) || \
-    ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE)
-  // Use the standard version
-  return strerror_r(err, buffer, bufsize) == 0 ?
-    buffer : const_cast<char*>("strerror_r failed");
-#else
-  // Use the gnu specific version
-  return strerror_r(err, buffer, bufsize);
-#endif
-}
-
 #define VALIDATE_PTHREAD_RESULT(result) \
   if (result != 0) { \
     const int kBufferSize = 1024; \
     char error_buf[kBufferSize]; \
     FATAL2("pthread error: %d (%s)", result, \
-           strerror_helper(result, error_buf, kBufferSize)); \
+           Utils::StrError(result, error_buf, kBufferSize)); \
   }
 
 
@@ -52,7 +41,7 @@ static char* strerror_helper(int err, char* buffer, size_t bufsize) {
     char error_buf[kBufferSize]; \
     fprintf(stderr, "%s:%d: pthread error: %d (%s)\n", \
             __FILE__, __LINE__, result, \
-            strerror_helper(result, error_buf, kBufferSize)); \
+            Utils::StrError(result, error_buf, kBufferSize)); \
     return result; \
   }
 #else