Add 'ldif.h' into -devel subpackage. 'libldif' was removed by upstrem and the symbols
were moved to 'libldap'. But the interface is missing.

Author: Jan Vcelak <jvcelak@redhat.com>

diff -uNPrp openldap-2.4.25/include/Makefile.in openldap-2.4.25.ldif/include/Makefile.in
--- openldap-2.4.25/include/Makefile.in	2011-01-05 00:49:52.000000000 +0100
+++ openldap-2.4.25.ldif/include/Makefile.in	2011-06-27 17:13:57.629416190 +0200
@@ -20,7 +20,8 @@ install-local: FORCE
 	for header in $(srcdir)/lber.h lber_types.h \
 		$(srcdir)/ldap.h $(srcdir)/ldap_cdefs.h \
 		$(srcdir)/ldap_schema.h $(srcdir)/ldap_utf8.h \
-		$(srcdir)/slapi-plugin.h ldap_features.h; \
+		$(srcdir)/slapi-plugin.h ldap_features.h \
+		$(srcdir)/ldif.h; \
 	do \
 		$(INSTALL) $(INSTALLFLAGS) -m 644 $$header $(DESTDIR)$(includedir); \
 	done