9943 gfx-drm should use own bldenv copy
Reviewed by: Adam &#352;tevko <adam.stevko@gmail.com>
Reviewed by: Andy Fiddaman <omnios@citrus-it.net>

8400 top-level Makefile shouldn't assume "make" is usable
Reviewed by: Gordon Ross <gordon.w.ross@gmail.com>
Reviewed by: Alexander Pyhalov <alp@rsu.ru>

8390 from-scratch build fails due to missing tool dir links

8048 panic in drm_gem_unmap with Xorg 1.18
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Aurlien Larcher <aurelien.larcher@gmail

8048 panic in drm_gem_unmap with Xorg 1.18
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Aurlien Larcher <aurelien.larcher@gmail.com>

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Add a top-level Makefile for convenience, and simplify myenv.sh