Remove old GCC version checks

Source/Core/Common/ChunkFile.h

@@ -35,20 +35,8 @@
 
 // ewww
 
-#ifndef __has_feature
-#define __has_feature(x) (0)
-#endif
-
-#if (__has_feature(is_trivially_copyable) &&                                                       \
-     (defined(_LIBCPP_VERSION) || defined(__GLIBCXX__))) ||                                        \
-    (defined(__GNUC__) && __GNUC__ >= 5) || defined(_MSC_VER)
 #define IsTriviallyCopyable(T)                                                                     \
   std::is_trivially_copyable<typename std::remove_volatile<T>::type>::value
-#elif __GNUC__
-#define IsTriviallyCopyable(T) std::has_trivial_copy_constructor<T>::value
-#else
-#error No version of is_trivially_copyable
-#endif
 
 // Wrapper class
 class PointerWrap

Source/Core/Common/LinearDiskCache.h

@@ -56,15 +56,9 @@ public:
   {
     using std::ios_base;
 
-// Since we're reading/writing directly to the storage of K instances,
-// K must be trivially copyable. TODO: Remove #if once GCC 5.0 is a
-// minimum requirement.
-#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 5
-    static_assert(std::has_trivial_copy_constructor<K>::value,
-                  "K must be a trivially copyable type");
-#else
+    // Since we're reading/writing directly to the storage of K instances,
+    // K must be trivially copyable.
     static_assert(std::is_trivially_copyable<K>::value, "K must be a trivially copyable type");
-#endif
 
     // close any currently opened file
     Close();

Source/Core/VideoBackends/Vulkan/ShaderCache.cpp

@@ -532,14 +532,8 @@ struct VK_PIPELINE_CACHE_HEADER
   u8 uuid[VK_UUID_SIZE];
 };
 #pragma pack(pop)
-// TODO: Remove the #if here when GCC 5 is a minimum build requirement.
-#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 5
-static_assert(std::has_trivial_copy_constructor<VK_PIPELINE_CACHE_HEADER>::value,
-              "VK_PIPELINE_CACHE_HEADER must be trivially copyable");
-#else
 static_assert(std::is_trivially_copyable<VK_PIPELINE_CACHE_HEADER>::value,
               "VK_PIPELINE_CACHE_HEADER must be trivially copyable");
-#endif
 
 bool ShaderCache::ValidatePipelineCache(const u8* data, size_t data_length)
 {