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 ]

tools/python/xen/lowlevel/xc/xc.c

@@ -5,6 +5,7 @@
  */
 
 #include <Python.h>
+#define XC_WANT_COMPAT_MAP_FOREIGN_API
 #include <xenctrl.h>
 #include <fcntl.h>
 #include <netinet/in.h>
@@ -15,6 +16,7 @@
 #include <netdb.h>
 #include <arpa/inet.h>
 
+#include <xen/elfnote.h>
 #include <xen/tmem.h>
 #include "xc_dom.h"
 #include <xen/hvm/hvm_info_table.h>