Sandbox makefile: updated doc for def-version.
Sandbox makefile: Added more packages.
Sandbox makefile: bashed dup entry for patch package.
Sandbox makefile: Added optional cURL deps.
Sandbox makefile updates.

- Bashed decompressed dir. Decompressed src goes into src and we'll place
directly in that.
- The new bootstrap stuff requires DIRS to be declared differently. Moved
decl as needed.
Sandbox makefile: Bashed superfluous '/'.
Sandbox makefile: Disabled more implicit make rules and variables.
Sandbox makefile boostrap updates.

- Started on bootstrap for sandbox makefile. It presumes user has old version
of curl, tar and plugins, and gcc, then downloads and builds new curl and tar.
This way we can still use .xz archives for other packages when not supported
by host.

It appears that the curl config and build aren't working correctly. make
install must be run 2x. Investigating.