This reverts commit 5eef9da416.
This breaks full rebuilds with the following error (Jenkins logs):
00:25:40 configure: creating ./config.status
00:25:41 config.status: creating Makefile
00:25:41 config.status: error: cannot find input file: `data/Makefile.in'
This also broke incremental builds with a different but just
as confusing autofoo error message.