build: Make symlink depend on source
build: Make symlink depend on source

Closes: https://github.com/ostreedev/ostree/issues/389

Closes: #400
Approved by: smcv

gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree