The jim-nvp code is specific to openocd, so it belongs in openocd,
not in the core jimtcl.

Signed-off-by: Steve Bennett <steveb@workware.net.au>

This is required so the OpenULINK driver knows the install location of the OpenULINK
firmware image.

Rather than having to configure/build jimtcl openocd
will do this as part of its own build.

To use an external jimtcl lib specify disable-internal-jimtcl
to the configure step.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>

Rather than specifying common makefile variables move
them all to a common.mk.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>