Implemented OpenProcess on top of NtOpenProcess.

diff --git a/include/winternl.h b/include/winternl.h
index 36abdd6..7d4e75d 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -1695,6 +1695,7 @@
 NTSTATUS  WINAPI NtOpenIoCompletion(PHANDLE,ACCESS_MASK,POBJECT_ATTRIBUTES);
 NTSTATUS  WINAPI NtOpenKey(PHANDLE,ACCESS_MASK,const OBJECT_ATTRIBUTES *);
 NTSTATUS  WINAPI NtOpenMutant(PHANDLE,ACCESS_MASK,const OBJECT_ATTRIBUTES*);
+NTSTATUS  WINAPI NtOpenProcess(PHANDLE,ACCESS_MASK,const OBJECT_ATTRIBUTES*,const CLIENT_ID*);
 NTSTATUS  WINAPI NtOpenProcessToken(HANDLE,DWORD,HANDLE *);
 NTSTATUS  WINAPI NtOpenSection(HANDLE*,ACCESS_MASK,const OBJECT_ATTRIBUTES*);
 NTSTATUS  WINAPI NtOpenSemaphore(PHANDLE,ACCESS_MASK,const OBJECT_ATTRIBUTES*);