Fuchsia: Add native symbol resolver. Small fixes.

runtime/platform/utils_fuchsia.h

Index: runtime/platform/utils_fuchsia.h
diff --git a/runtime/platform/utils_fuchsia.h b/runtime/platform/utils_fuchsia.h
index 4e8c4e97796c2483592c5602935fb67f86cd0e12..575c3dbf5874b2cd9c0b96b716def20539e51682 100644
--- a/runtime/platform/utils_fuchsia.h
+++ b/runtime/platform/utils_fuchsia.h
@@ -62,7 +62,9 @@ inline uint64_t Utils::HostToLittleEndian64(uint64_t value) {
 
 
 inline char* Utils::StrError(int err, char* buffer, size_t bufsize) {
-  snprintf(buffer, bufsize, "errno = %d", err);
+  if (strerror_r(err, buffer, bufsize) != 0) {
+    snprintf(buffer, bufsize, "%s", "strerror_r failed");
+  }
   return buffer;
 }