mk: Distribute fewer TARGET_CRATES

Right now everything in TARGET_CRATES is built by default for all non-fulldeps
tests and is distributed by default for all target standard library packages.
Currenly this includes a number of unstable crates which are rarely used such as
`graphviz` and `rbml`>

This commit trims down the set of `TARGET_CRATES`, moves a number of tests to
`*-fulldeps` as a result, and trims down the dependencies of libtest so we can
distribute fewer crates in the `rust-std` packages.

src/liballoc/lib.rs

@@ -92,16 +92,13 @@
 #![feature(unsize)]
 
 #![cfg_attr(not(test), feature(raw, fn_traits, placement_new_protocol))]
-#![cfg_attr(test, feature(test, rustc_private, box_heap))]
+#![cfg_attr(test, feature(test, box_heap))]
 
 // Allow testing this library
 
 #[cfg(test)]
 #[macro_use]
 extern crate std;
-#[cfg(test)]
-#[macro_use]
-extern crate log;
 
 // Heaps provided for low-level allocation strategies