Revert "cel: fix gcc contrib build (envoyproxy#31814)"

This reverts commit 21c4a2c.

Signed-off-by: Greg Greenway <[email protected]>

bazel/cel-cpp.patch

@@ -11,54 +11,6 @@ index 6aeff6d..c43864c 100644
      cel::runtime_internal::kPayloadUrlMissingAttributePath;
 
  CelValue CelValue::CreateDuration(absl::Duration value) {
-diff --git a/eval/public/containers/container_backed_map_impl.h b/eval/public/containers/container_backed_map_impl.h
-index 6092eef..7548bbf 100644
---- a/eval/public/containers/container_backed_map_impl.h
-+++ b/eval/public/containers/container_backed_map_impl.h
-@@ -30,6 +30,7 @@ class CelMapBuilder : public CelMap {
-     return values_map_.contains(cel_key);
-   }
-
-+  using CelMap::ListKeys;
-   absl::StatusOr<const CelList*> ListKeys() const override {
-     return &key_list_;
-   }
-diff --git a/eval/public/containers/internal_field_backed_map_impl.h b/eval/public/containers/internal_field_backed_map_impl.h
-index ec773d9..caa2f3a 100644
---- a/eval/public/containers/internal_field_backed_map_impl.h
-+++ b/eval/public/containers/internal_field_backed_map_impl.h
-@@ -43,6 +43,7 @@ class FieldBackedMapImpl : public CelMap {
-   // Presence test function.
-   absl::StatusOr<bool> Has(const CelValue& key) const override;
-
-+  using CelMap::ListKeys;
-   absl::StatusOr<const CelList*> ListKeys() const override;
-
-  protected:
-diff --git a/eval/public/structs/cel_proto_lite_wrap_util.cc b/eval/public/structs/cel_proto_lite_wrap_util.cc
-index 4cb21e5..35fdf7f 100644
---- a/eval/public/structs/cel_proto_lite_wrap_util.cc
-+++ b/eval/public/structs/cel_proto_lite_wrap_util.cc
-@@ -172,6 +172,7 @@ class DynamicMap : public CelMap {
-
-   int size() const override { return values_->fields_size(); }
-
-+  using CelMap::ListKeys;
-   absl::StatusOr<const CelList*> ListKeys() const override {
-     return &key_list_;
-   }
-diff --git a/eval/public/structs/cel_proto_wrap_util.cc b/eval/public/structs/cel_proto_wrap_util.cc
-index fabb594..86a314c 100644
---- a/eval/public/structs/cel_proto_wrap_util.cc
-+++ b/eval/public/structs/cel_proto_wrap_util.cc
-@@ -137,6 +137,7 @@ class DynamicMap : public CelMap {
-
-   int size() const override { return values_->fields_size(); }
-
-+  using CelMap::ListKeys;
-   absl::StatusOr<const CelList*> ListKeys() const override {
-     return &key_list_;
-   }
 diff --git a/internal/strings.cc b/internal/strings.cc
 index dc5a118..24457ab 100644
 --- a/internal/strings.cc