bug#7452: Duplicated Definitions

[Tak Ota]

I had to remove the following definition in src/w32.c because it is
already defined in MinGW/include/psapi.h in the latest MinGW.

-Tak

/* This either is not in psapi.h or guarded by higher value of
   _WIN32_WINNT than what we use.  */
typedef struct _PROCESS_MEMORY_COUNTERS_EX {
        DWORD cb;
        DWORD PageFaultCount;
        DWORD PeakWorkingSetSize;
        DWORD WorkingSetSize;
        DWORD QuotaPeakPagedPoolUsage;
        DWORD QuotaPagedPoolUsage;
        DWORD QuotaPeakNonPagedPoolUsage;
        DWORD QuotaNonPagedPoolUsage;
        DWORD PagefileUsage;
        DWORD PeakPagefileUsage;
        DWORD PrivateUsage;
} PROCESS_MEMORY_COUNTERS_EX,*PPROCESS_MEMORY_COUNTERS_EX;