The 'copy_to' function turned out to be not flexible enough to
accommodate the Noux fork mechanism. This patch removes the function,
adds an accessor for the capability destination and a compound type
'Native_capability::Raw' to be used wherever plain capability
information must be communicated.
The kernel distinguishes local from global IDs by looking at the lowest
6 bits of the thread ID (i.e., in 'L4_ThreadControl'). If those bits are
zero, the ID is interpreted as a local ID. Because those zero bits
overlap with the version bits of global IDs, this invariant could be
violated once the version of a global ID reaches 64. In this case,
'L4_ThreadControl' will return an error on the attempt to create a new
PD. To prevent this from happening, we always set the lowest bit to 1.
