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windows: RtlGenRandom cannot always be statically linked

--- a/kern/win32.c

+++ b/kern/win32.c

@@ -126,12 +126,16 @@

 	ReleaseSemaphore(op->sema, 1, 0);

 }

-#define RtlGenRandom	SystemFunction036

-BOOLEAN WINAPI RtlGenRandom(PVOID, ULONG);

+BOOLEAN WINAPI (*RtlGenRandom)(PVOID, ULONG);

 void

 randominit(void)

 {

+	HMODULE mod;

+	

+	mod = LoadLibraryW(L"ADVAPI32.DLL");

+	if(mod != NULL)

+		RtlGenRandom = (void *) GetProcAddress(mod, "SystemFunction036");

 }

 ulong