PR #1846: Fix build on big endian

Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1846

Currently getting the following compilation error:
```
 error: uninitialized 'const kGolden' [-fpermissive]
```
Merge d91fffa8396bb618e5f8a0985a540f5f9d6abcf0 into 52190ca7fae29d820923304f0fd28b4a56392484

Merging this change closes #1846

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1846 from miladfarca:fix-be d91fffa8396bb618e5f8a0985a540f5f9d6abcf0
PiperOrigin-RevId: 731041395
Change-Id: Ibee7f5b04ec4e3c5e249321128c0ab46179c5b71

absl/hash/internal/low_level_hash_test.cc

diff --git a/absl/hash/internal/low_level_hash_test.cc b/absl/hash/internal/low_level_hash_test.cc
index 2b8ec65..d370dc7 100644
--- a/absl/hash/internal/low_level_hash_test.cc
+++ b/absl/hash/internal/low_level_hash_test.cc
@@ -362,7 +362,7 @@
   };
 
 #if defined(ABSL_IS_BIG_ENDIAN)
-  constexpr uint64_t kGolden[kNumGoldenOutputs];
+  constexpr uint64_t kGolden[kNumGoldenOutputs] = {};
   GTEST_SKIP() << "We only maintain golden data for little endian systems.";
 #else
   constexpr uint64_t kGolden[kNumGoldenOutputs] = {