Commit
003dffde2c1b93 ("machined: Move image discovery logic into src/shared,
so that we can make use of it from nspawn") moved some definitions from
machine.h to a new machine-dbus.h, but did not include it in Makefile.am
Tested that `make distcheck` works after this fix.
src/machine/machine.h \
src/machine/machined-dbus.c \
src/machine/machine-dbus.c \
src/machine/machine.h \
src/machine/machined-dbus.c \
src/machine/machine-dbus.c \
+ src/machine/machine-dbus.h \
src/machine/image-dbus.c \
src/machine/image-dbus.h
src/machine/image-dbus.c \
src/machine/image-dbus.h