Alexander Boettcher ae6257dce1 Use NOVA microkernel from github, add 64bit
Use git to get recent kernels from github. Adjust NOVA patch to compile
with recent github version. Patch and use makefile of NOVA microkernel
to avoid duplicated (and outdated) makefile in Genode

Furthermore, this patch adds support for using NOVA on x86_64. The
generic part of the syscall bindings has been moved to
'base-nova/include/nova/syscall-generic.h'. The 32/64-bit specific
parts are located at 'base-nova/include/32bit/nova/syscalls.h' and
'base-nova/include/64bit/nova/syscalls.h' respectively.

On x86_64, the run environment boots qemu using the Pulsar boot loader
because GRUB legacy does not support booting 64bit ELF executables.

In addition to the NOVA-specific changes in base-nova, this patch
rectifies compile-time warnings or build errors in the 'ports' and
'libports' repositories that are related to NOVA x86_64 (i.e., Vancouver
builds for 32bit only and needed an adaptation to NOVAs changed
bindings)

Fixes #233, fixes #234
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This directory contains the build system. In consists mainly of makefile
templates for different directory roles.

:'global.mk': This file contains global variables, for example the
  definitions of the tools to use.

:'generic.mk': Generic rules for creating file types from others.

:'prg.mk': This file represents the target binary role of a directory.
  It must be included by all makefiles that build programs.

:'lib.mk': This file represents a library role. It is never used from
  within the 'src/' directory but only from the <libname>.mk files
  in 'lib/mk/'.