Add 'creds.h', a new include file, so it will appear in the 'make dist'
tarball. Fixes a build problem.
include/inode.h include/mount.h include/sysio.h include/sysio-cmn.h \
include/sysio-symbols.h include/cplant-yod.h \
include/module.mk include/xtio.h include/stddir.h \
include/inode.h include/mount.h include/sysio.h include/sysio-cmn.h \
include/sysio-symbols.h include/cplant-yod.h \
include/module.mk include/xtio.h include/stddir.h \
+ include/native.h include/creds.h