Add vki/vki-xen-tmem.h to include/Makefile.am nobase_pkginclude_HEADERS.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13866 a5019735-40e9-0310-863c-91ae7b9d1cf9
Add vgdb.h to coregrind/Makefile.am noinst_HEADERS.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13867 a5019735-40e9-0310-863c-91ae7b9d1cf9
Make sure all files under the new shared dir are included in make dist.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13868 a5019735-40e9-0310-863c-91ae7b9d1cf9