Merge userspace support for Philip Withnall's compositor.
Conditionalize the contents of this file on SOFTFLOAT_FOR_GCC so
it's possible to build components without builtins.

Change 219875 by brooks@brooks_zenith on 2012/12/04 16:43:54
Merge demo and support code from P4.

The hierarchy have been revamped so everything sits in a single top
level directory and is organized by where it is installed as is common
in the FreeBSD source tree.

libde4tc has been renamed to libterasic_mtl.