Fix FTBFS on Debian

This extends commit d8856bdf

lib/libbbbgpmc/debian/rules

@@ -17,10 +17,15 @@ DEB_DH_BUILDDEB_ARGS += -- -Z$(shell dpkg-deb --help | grep -q ":.* xz[,.]" \
 post-patches:: debian/stamp-bootstrap
 
 debian/stamp-bootstrap:
-	! [ -f /usr/share/libtool/ltmain.sh ] || \
+ifneq "$(wildcard /usr/share/libtool/ltmain.sh)" ""
 	cp -f /usr/share/libtool/ltmain.sh admin/ltmain.sh
-	! [ -f /usr/share/libtool/config/ltmain.sh ] || \
+endif
+ifneq "$(wildcard /usr/share/libtool/config/ltmain.sh)" ""
 	cp -f /usr/share/libtool/config/ltmain.sh admin/ltmain.sh
+endif
+ifneq "$(wildcard /usr/share/libtool/build-aux/ltmain.sh)" ""
+	cp -f /usr/share/libtool/build-aux/ltmain.sh admin/ltmain.sh
+endif
 	cp -f /usr/share/aclocal/libtool.m4 admin/libtool.m4.in
 	
 	make -f admin/Makefile.common cvs