build fix, preserve depfiles generated stuff

Submitted by Fabrice Bellet

Assigned to Telepathy bugs list

Created attachment 128211 build: preserve depfiles generated stuff

Hi!

Removing all _gen subdir also removes *.Plo dependencies files generated by depfiles during configure. Missing .Plo files breaks build.

Patch 128211, "build: preserve depfiles generated stuff":
0001-build-preserve-depfiles-generated-stuff.patch

Version: git master