don't dllexport Log and HookList

src/internal_logging.h

@@ -89,7 +89,7 @@ class LogItem {
   } u_;
 };
 
-extern PERFTOOLS_DLL_DECL void Log(LogMode mode, const char* filename, int line,
+extern void Log(LogMode mode, const char* filename, int line,
                 LogItem a, LogItem b = LogItem(),
                 LogItem c = LogItem(), LogItem d = LogItem());
 

src/malloc_hook-inl.h

@@ -60,7 +60,7 @@ static const int kHookListSingularIdx = 7;
 // HookList: a class that provides synchronized insertions and removals and
 // lockless traversal.  Most of the implementation is in malloc_hook.cc.
 template <typename T>
-struct PERFTOOLS_DLL_DECL HookList {
+struct HookList {
   static_assert(sizeof(T) <= sizeof(uintptr_t), "must fit in uintptr_t");
 
   constexpr HookList() = default;