Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/CPP/Windows/System.cpp

-// Windows/System.cpp
-
-#include "StdAfx.h"
-
-#include "System.h"
-
-namespace NWindows {
-namespace NSystem {
-
-UInt32 GetNumberOfProcessors()
-{
-  SYSTEM_INFO systemInfo;
-  GetSystemInfo(&systemInfo);
-  return (UInt32)systemInfo.dwNumberOfProcessors;
-}
-
-#if !defined(_WIN64) && defined(__GNUC__)
-
-typedef struct _MY_MEMORYSTATUSEX {
-  DWORD dwLength;
-  DWORD dwMemoryLoad;
-  DWORDLONG ullTotalPhys;
-  DWORDLONG ullAvailPhys;
-  DWORDLONG ullTotalPageFile;
-  DWORDLONG ullAvailPageFile;
-  DWORDLONG ullTotalVirtual;
-  DWORDLONG ullAvailVirtual;
-  DWORDLONG ullAvailExtendedVirtual;
-} MY_MEMORYSTATUSEX, *MY_LPMEMORYSTATUSEX;
-
-#else
-
-#define MY_MEMORYSTATUSEX MEMORYSTATUSEX
-#define MY_LPMEMORYSTATUSEX LPMEMORYSTATUSEX
-
-#endif
-
-typedef BOOL (WINAPI *GlobalMemoryStatusExP)(MY_LPMEMORYSTATUSEX lpBuffer);
-
-UInt64 GetRamSize()
-{
-  MY_MEMORYSTATUSEX stat;
-  stat.dwLength = sizeof(stat);
-  #ifdef _WIN64
-  if (!::GlobalMemoryStatusEx(&stat))
-    return 0;
-  return stat.ullTotalPhys;
-  #else
-  GlobalMemoryStatusExP globalMemoryStatusEx = (GlobalMemoryStatusExP)
-        ::GetProcAddress(::GetModuleHandle(TEXT("kernel32.dll")),
-        "GlobalMemoryStatusEx");
-  if (globalMemoryStatusEx != 0)
-    if (globalMemoryStatusEx(&stat))
-      return stat.ullTotalPhys;
-  {
-    MEMORYSTATUS stat;
-    stat.dwLength = sizeof(stat);
-    GlobalMemoryStatus(&stat);
-    return stat.dwTotalPhys;
-  }
-  #endif
-}
-
-}}