build: Fix "make dvi" and "make distcheck" error.

* bootstrap.conf (gnulib_extra_files): Add build-aux/epsf.tex.
* build-aux/local.mk (EXTRA_DIST): Add build-aux/epsf.tex.

bootstrap.conf

@@ -84,6 +84,8 @@ gnulib_tool_option_extras='--symlink --conditional-dependencies --makefile-name=
 
 gnulib_extra_files="$gnulib_extra_files build-aux/move-if-change"
 
+gnulib_extra_files="$gnulib_extra_files build-aux/epsf.tex"
+
 bootstrap_post_import_hook()
 {
   # Ensure that ChangeLog exists, for automake.

build-aux/.gitignore

@@ -7,6 +7,7 @@
 /config.sub
 /depcomp
 /do-release-commit-and-tag
+/epsf.tex
 /gendocs.sh
 /git-version-gen
 /gitlog-to-changelog

build-aux/local.mk

@@ -18,6 +18,7 @@ EXTRA_DIST +=					\
   build-aux/Darwin.valgrind			\
   build-aux/Linux.valgrind			\
   build-aux/cross-options.pl			\
+  build-aux/epsf.tex				\
   build-aux/move-if-change			\
   build-aux/prev-version.txt			\
   build-aux/update-b4-copyright