Upgrade to 3.7.0 RC3.
Enabled compiler-rt on amd64 and i386. Patches greatfully acepted for
other architectures.
Remove svn patches as an alternate fix has been merged.
Apply a couple upstream clang patches to hopefully fix a crash building
blender with clang and openmp.
Reported by: Shane Ambler <FreeBSD@ShaneWare.Biz>