Tidy up cross-compiling

We have two cases:
 1. building a cross-compiler
 2. compiling GHC to run on a foreign platform

These two are done with almost the same setup: (1) is the stage 1
compiler, and (2) is the stage 2 compiler, when CrossCompiling=YES.

The only difference between (1) and (2) is that you if you set up the
build for (1), then it stops before stage 2 and you can 'make install'
to install stage 1.

Unfortunately, (2) didn't work, and the build system code needed some
tidying up.

Change to the way the build is set up:

Before
------

To build a cross-compiler:
  ./configure --target=<..>

To compile a foreign GHC:
  ./configure --host=<..> --target=<..>

Now
---

To build a cross-compiler:
  ./configure --target=<..>
  And set "Stage1Only=YES" in mk/build.mk

To compile a foreign GHC:
  ./configure --target=<..>

1 files changed, 0 insertions, 0 deletions

diff --git a/libraries/primitive b/libraries/primitive
deleted file mode 160000
-Subproject 75c3379b6d76e914cc3c7ffd290b6b1cad7ea3e