Regenerate src/emacs-module.h when emacs-module.h.in changes

* Makefile.in (CONFIG_STATUS_FILES_IN): Add
src/emacs-module.h.in.

Makefile.in

@@ -320,7 +320,7 @@ SUBDIR_MAKEFILES = $(patsubst ${srcdir}/%,%,${SUBDIR_MAKEFILES_IN:.in=})
 # Non-makefile files created by config.status.
 CONFIG_STATUS_FILES_IN = \
  ${srcdir}/nt/emacs.rc.in ${srcdir}/nt/emacsclient.rc.in \
- ${srcdir}/doc/man/emacs.1.in
+ ${srcdir}/doc/man/emacs.1.in ${srcdir}/src/emacs-module.h.in
 
 # Subdirectories to install, and where they'll go.  lib-src's and nt's
 # makefiles know how to install them, so we don't do that here.