tools: Refactor foreign memory mapping into libxenforeignmemory

libxenforeignmemory will provide a stable API and ABI for mapping
foreign domain memory (subject to appropriate privileges).

The new library exposes an interface equivalent to
xc_map_foreign_memory_bulk, which all the other
xc_map_foreign_memory_* functions (which remain in libxc) are
implemented in terms of.

Upon request (via #define XC_WANT_COMPAT_MAP_FOREIGN_API) libxenctrl
will provide a compat API for the old names. This is used by qemu-xen
and qemu-trad as well as various in tree things (which required
de-dupping various #includes in some too to get the #define before the
first).

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
[ ijc -- updated MINIOS_UPSTREAM_REVISION and QEMU_TRADITIONAL_REVISION ]

.gitignore

@@ -64,6 +64,7 @@ stubdom/libs-*
 stubdom/libxc-*
 stubdom/libxencall-*
 stubdom/libxenevtchn-*
+stubdom/libxenforeignmemory-*
 stubdom/libxengnttab-*
 stubdom/libxentoollog-*
 stubdom/lwip-*
@@ -93,6 +94,7 @@ tools/libs/toollog/headers.chk
 tools/libs/evtchn/headers.chk
 tools/libs/gnttab/headers.chk
 tools/libs/call/headers.chk
+tools/libs/foreignmemory/headers.chk
 tools/blktap2/daemon/blktapctrl
 tools/blktap2/drivers/img2qcow
 tools/blktap2/drivers/lock-util