fix build by adding a Makefile.inc that chains up.

Centralize the base rump libraries into a variable used by all the other
Makefiles so that we can make changes to it centrally as needed and have
less mess. Fixes the sun2 build that needs rumpvfs af

Centralize the base rump libraries into a variable used by all the other
Makefiles so that we can make changes to it centrally as needed and have
less mess. Fixes the sun2 build that needs rumpvfs after librump after
the latest changes.

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Deal with fallout from the addition of
KERN_PROC_CWD in sysctl(3)
That is kern.proc.$$.KERN_PROC_CWD (I think - not that it matters here)

The effect is that -lrump now requires -lrumpvfs

This set

Deal with fallout from the addition of
KERN_PROC_CWD in sysctl(3)
That is kern.proc.$$.KERN_PROC_CWD (I think - not that it matters here)

The effect is that -lrump now requires -lrumpvfs

This set of changes fixes (I believe) regular dynamic builds,
more might be required for static builds (will be verified soon).

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Fix fallout from hid factorisation:
- need to install sys/dev/hid/hid.h for userland
- include it where needed - most of the time in place if usb/usbhid.h

rework build of t_hid to be more reliable, while working around ATF cruddyness