ntdll: Stub system service requests in i386 mode (Int 2E, SYSENTER, SYSCALL)

[Paul Chitescu]

Changelog:
	ntdll: Stub system service requests in i386 mode (Int 2E, SYSENTER, SYSCALL)

Some system checkers, antiviruses and protections make direct system service 
requests bypassing the Nt... entry points. Oh, and probably some viruses too.

On Linux (at least) SYSCALL is used by the system so we won't have a chance to 
see it, it crashes the application.

No idea if this mechanism is used on other architectures and what is the call 
convention there.

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