gcc: Clean-up of non-C++0x compliant code, first steps

This patch cleans up a number of minor issues aiming to get closer to
compliance with the C++0x standard as interpreted by gcc and clang
(compile with std=c++0x and -pedantic-errors). In particular, the
patch cleans up enums where the last item was succeded by a comma,
namespaces closed by a curcly brace followed by a semi-colon, and the
use of the GNU-extension typeof (replaced by templated functions). It
does not address variable-length arrays, zero-size arrays, anonymous
structs, range expressions in switch statements, and the use of long
long. The generated CPU code also has a large number of issues that
remain to be fixed, mainly related to overflows in implicit constant
conversion (due to shifts).

x86: implements vtophys

Calls walker to look up virt. to phys. page mapping

copyright: Change HP copyright on x86 code to be more friendly

types: Move stuff for global types into src/base/types.hh

X86: Start implementing the x86 tlb which will handle segmentation permission and limit checks and paging.

Fill out a stub version of the vtophys header file.

Add build hooks for x86.