Cleanup: Fix build error with clang on windows.

Header and implementation signature for ED_object_add_duplicate
were not the same leading to a build error with clang on windows.

deps: Fix build issue with USD on windows.

When doing a release build the TBB debug libs are not
set which was causing an error during the configure
phase of USD, so always set them even if not used.

Build: upgrade OpenImageDenoise to 1.2.1

This requires ISPC for building OpenImageDenoise, so that is now added as
a dependency as well. Blender itself does not need ISPC for building so it
is not included as part of the precompiled libraries.

Differential Revision: https://developer.blender.org/D7641

Fix T76767: Cycles performance regression with CLI renders

When picking a small tile size when doing a CLI render will
yield many status updates being printed to the console
causing a slowdown in the render process. 2.79 with the
same amount of tiles did not have this slowdown.

The reason for this turned out to be a debugging aid added
in rBd2757d149bf2 which disabled buffering for stdout which
on windows caused every single character being printed to the
console to try to obtain a mutex, and worse the thread being
put to sleep when this mutex was unavailable leading to poor
performance.

This patch changes the behaviour by only disabling the
buffering in debug builds.

CLI render of the default cube with 16x16 tiles at 1080p

2.83 : 37.57s
now : 17.03s

note: this only affected CLI renders, renders from the UI
do not report this kind of information and had no such
slowdown.

Fix T78047: Fix failing denoiser tests on windows

When we switched to MSVC2019 and C++17 we seemingly
managed to trigger a code-gen bug with MSVC in the
AVX code-path.

This change works around the issue by (hopefully
temporary) disabling the optimizer for the fast_exp2f4
function, given it is only used in a single pass
of the denoiser and nowhere else, this is luckily
not as bad as it could have been.

Once the compiler is fixed or a different fix is
available we'll have to revisit this.

Details and link to the repro posted to MS is
available in T78047

Cleanup: Fix build-warning with MSVC

Draco sets CMAKE_CXX_STANDARD to 14, given we
set the c++ standard in the root level CMakeLists.txt
to c++17 this generated build warnings.

Given the rootlevel one is the one we want we can
safely remove this line in dracos cmakelists

Fix T76767: Cycles performance regression with CLI renders

When picking a small tile size when doing a CLI render will
yield many status updates being printed to the console
causing a slowdown in the render process. 2.79 with the
same amount of tiles did not have this slowdown.

The reason for this turned out to be a debugging aid added
in rBd2757d149bf2 which disabled buffering for stdout which
on windows caused every single character being printed to the
console to try to obtain a mutex, and worse the thread being
put to sleep when this mutex was unavailable leading to poor
performance.

This patch changes the behaviour by only disabling the
buffering in debug builds.

CLI render of the default cube with 16x16 tiles at 1080p

2.83 : 37.57s
now : 17.03s

note: this only affected CLI renders, renders from the UI
do not report this kind of information and had no such
slowdown.

deps/windows/embree: Prevent exports leaking out of blender binary

embree marks a few of its functions with a dll_export macro
forcibly exporting these symbols from whatever binary links
them. Given we link embree statically and we do not want these
exports in the blender binary, the macro needs to be a no-op.

Deps builder: Python 3.7.7

This updates python to the latest patch level available for 3.7
also updates some of the packages we rely on:

idna 2.9
urllib3 1.25.9
cerifi 2020.4.5.2
requests 2.23.0
numpy 1.17.5

deps: Update lib names for USD on windows