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[rt] Merge boehm.h into exceptions.c

mps_tramp wasn't required outside of the exceptions code, so this
cleans things up a bit.
[rt] Remove unused variable.
[rt] GC_USE_MALLOC support for C runtime.
[rt] Initialize threads even when not using Boehm.
[doc,hackers] Cross-compilation instructions.

This is a first draft of documentation on performing cross-compilation
to a new target platform.
[doc,hackers] Clarify some duplicated wording.

Now that the run-times are merged, some wording was duplicated
between the C and LLVM back-end discussions.
Change whitespace and Culprit: header -> Author:.
Fix unusual formatting and a few long lines.
Avoid potential recursion when printing an unnamed <class> object.
Merge pull request #511 from cgay/conditions

Fix unusual formatting and a few long lines.
Import Gtk+ library

The library (and dependencies) was generated by gir-dylan, some manual changes
were made:

- Changed gobject-glue to use gobject and glib, removing duplicate functions
  and objects
- Fixed pkg-config library name for some libraries
- Changed the value of $MININT32 in glib-dylan to fix a crash while compiling
Merge pull request #513 from fracek/duim-gtk

Import Gtk+ library
[dylan] Correct spelling of token.
[dylan] Dylan naming style rather than CL.
Remove primitive-byte-allocate.

This has been unused for a very long time and hasn't been implemented
in the HARP runtime for a long time.
[rt] Fewer exported / visible symbols.
Fix typo.
Fix typo: procesor -> architecture.
Merge pull request #515 from waywardmonkeys/remove-primitive-byte-allocate

Remove primitive-byte-allocate.