e2fsprogs: create com_err.h link in includedir

After debian bug #192277, debian/rules started making a symlink
to com_err.h in /usr/include.  Now I have Fedora bug #550889
for the same issue, and perhaps it's time to make this link
by default, rather than fixing it up in packaging steps?

[ Changed by tytso to remove the explicit -s option; this will default
  to creating a hard link by default, which slightly faster.  If
  people want to use symlinks for all links during the install
  process, they can use configure option --enable-symlink-install.
  The reason for this change is that some file systems, like AFS,
  don't support symlinks, and AFS users complain when they can't build
  or install into AFS.  So I don't want to use symlinks
  unconditionally without a way of switching things back and forth,
  and it's easier if we just make all links made during the install
  process to be hard links or sym links. ]

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

debian/rules

@@ -326,8 +326,6 @@ install-std: build
 	${INSTALL_PROGRAM} $(E2FSCK_STATIC) ${tmpdir}/sbin
 	cp ${mandir}/man8/e2fsck.8 ${mandir}/man8/e2fsck.static.8
 
-	ln -s et/com_err.h ${tmpdir}/usr/include
-
 	dh_movefiles
 	test -z "`find ${tmpdir} -type f`"
 

lib/et/Makefile.in

@@ -96,6 +96,7 @@ install:: compile_et libcom_err.a $(HFILES) installdirs com_err.pc
 		echo "	INSTALL_DATA $(includedir)/et/$$i"; \
 		$(INSTALL_DATA) $(srcdir)/$$i $(DESTDIR)$(includedir)/et/$$i; \
 	done
+	$(Q) $(LN) $(LINK_INSTALL_FLAGS) $(includedir)/et/com_err.h $(DESTDIR)$(includedir)
 	$(Q) for i in $(SHARE_FILES); do \
 		echo "	INSTALL_DATA $(datadir)/et/$$i"; \
 		$(INSTALL_DATA) $(srcdir)/$$i $(DESTDIR)$(datadir)/et/$$i; \