Remove references to PCVOID and LPUINT.
Remove types that don't exist on Windows.

diff --git a/include/winternl.h b/include/winternl.h
index 43ddb17..3568a36 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -990,7 +990,7 @@
 
 NTSTATUS  WINAPI RtlValidSecurityDescriptor(PSECURITY_DESCRIPTOR);
 BOOL      WINAPI RtlValidSid(PSID);
-BOOLEAN   WINAPI RtlValidateHeap(HANDLE,ULONG,PCVOID);
+BOOLEAN   WINAPI RtlValidateHeap(HANDLE,ULONG,LPCVOID);
 
 NTSTATUS  WINAPI RtlWalkHeap(HANDLE,PVOID);