vp9_level_stats,Vp9LevelRow: fix -Wc++20-compat warnings

This makes the struct an aggregate in C++20 terms [1], by removing the
default constructor. Another option would be to provide an explicit
constructor taking all of the members as arguments.

fixes:
common/vp9_level_stats.cc:20:5: warning: aggregate initialization of
type 'const vp9_parser::Vp9LevelRow' with user-declared constructors is
incompatible with C++20 [-Wc++20-compat]

[1] https://en.cppreference.com/w/cpp/language/aggregate_initialization
C++11: no user-provided, inherited, or explicit constructors
C++20: no user-declared or inherited constructors

Change-Id: I32fbee85016ea711a7425317493d5cf3c0a3b93d

2 files changed, 3 insertions, 7 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a83d23b..99e904f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,6 +48,9 @@ if (MSVC)
   endif ()
 else ()
   add_cxx_flag_if_supported("-Wall")
+  add_cxx_flag_if_supported("-Wc++14-compat")
+  add_cxx_flag_if_supported("-Wc++17-compat")
+  add_cxx_flag_if_supported("-Wc++20-compat")
   add_cxx_flag_if_supported("-Wextra")
   add_cxx_flag_if_supported("-Wnarrowing")
   add_cxx_flag_if_supported("-Wno-deprecated")
diff --git a/common/vp9_level_stats.h b/common/vp9_level_stats.h
index 45d6f5c..9e728d2 100644
--- a/common/vp9_level_stats.h
+++ b/common/vp9_level_stats.h
@@ -40,13 +40,6 @@ enum Vp9Level {
 };
 
 struct Vp9LevelRow {
-  Vp9LevelRow() = default;
-  ~Vp9LevelRow() = default;
-  Vp9LevelRow(Vp9LevelRow&& other) = default;
-  Vp9LevelRow(const Vp9LevelRow& other) = default;
-  Vp9LevelRow& operator=(Vp9LevelRow&& other) = delete;
-  Vp9LevelRow& operator=(const Vp9LevelRow& other) = delete;
-
   Vp9Level level;
   int64_t max_luma_sample_rate;
   int64_t max_luma_picture_size;