Revert "manifest.json: Fix build"

This reverts commit 59782700b4d3ca31904f14c209371827f00a45f3.

https://bugzilla.gnome.org/show_bug.cgi?id=739929
Revert "manifest: tag epiphany"

This reverts commit e19a3f01a37910bc64c9f066b2ad524b23d5c411.

https://bugzilla.gnome.org/show_bug.cgi?id=739929
manifest: Add webkitgtk-2.6.4 to the build

The cmake build API adapter is based on the libssh adapter written by
Colin Walters.

This also moved enchant above the webkitgtk4

https://bugzilla.gnome.org/show_bug.cgi?id=739929