peter-b / minipack

* Temporarily disable building from git.

* Build libgeda as a static library.  We're building gc as a static
  library, and as a result libtool is currently refusing to make
  libguile into a dynamic library (even though such a thing is
  perfectly reasonable).  This means that, in turn, libgeda has to
  be a static library.  Probably worth fixing at some point.

* atk-2.18
* cairo-1.15.2
* freetype-2.6
* gdk-pixbuf-2.32.3
* glib-2.46.2
* gtk+-2.24.29
* jpeg-9a
* libpng-1.5.26
* pango-1.28.1
* pixman 0.32.8
* tiff-4.0.6

* Change to using gc-7.2e, because gc-7.4.0 is hard to get working
* Compile gc and libatomic_ops as static libraries
* Update to gmp-6.1.0
* Update to libffi-3.1.1
* Update to libtool-2.4.6
* Update to libunistring-0.9.5
* Build libguile from tarball, and update to 2.0.11
* MinGW32 doesn't have clock_getcpuclockid()
* Add a minimal "to do" list

Facilitates necessary preliminary guile building and installation on the
build host system.

This partially solves issue with icons in gschem and pcb. Not all icons
are still present, though.

This reverts commit 54e131a as
compilation now works for the contrib/ directory.