media-gfx/blender: Set Build Type for Blender

Blender requires that the build type is set to None, Debug, Release,
RelWithDebInfo or MinSizeRel. This requires it to be overridden.

If this is not done, then it is set to Gentoo by cmake.eclass, and the
scripts in CMakeLists fail to set one of DEBUG or NDEBUG.

In blender 2.91, this results in not defining
GPU_vertex_buffer._data_end, but also attempting to execute an
assert which requires it to be defined.

Setting CMAKE_BUILD_TYPE to Release resolves the issue by setting
NDEBUG to prevent compilation of the assert, and unsetting DEBUG so
that the _data_end is not compiled.

This means that the patch to prevent the compilation of the assert is
no longer required.

Older version of blender in the tree also have the same requirement
for the value of CMAKE_BUILD_TYPE, but so far compiled correctly even
when it was set to Gentoo.

Signed-off-by: Adrian Grigo <agrigo2001@yahoo.com.au>
Package-Manager: Portage-3.0.9, Repoman-3.0.2
Signed-off-by: Joonas Niilola <juippis@gentoo.org>

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