bug#7452: Duplicated Definitions

[Tak Ota <Takaaki.Ota@am.sony.com>]

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;