build_deps: include venv on windows

MSVC: Fix obscure RNA related build error

When you switch between debug/release mode a lot, you could end up
in a situation where the generated RNA code was out of sync between
the two configurations.

There was one function optionally defined with an `#ifndef NDEBUG`
guard, this patch adds a stub implementation for the other configurations
to prevent build errors.

Differential Revision: https://developer.blender.org/D6855

Reviewers: brecht

BPY/Windows: Do not bundle the CRT for a bpy build

- Doesn't work
- If it worked, having a different CRT than the rest of
the process would not be a good thing.

Fix T70685: Cycles crash using WITH_CYCLES_NATIVE_ONLY on Windows

MSVC does not have -march=native, so the kernel gets built without AVX2 and
BVH8 support. The code assumed it to be available and crashed

Differential Revision: https://developer.blender.org/D6082

Cleanup/MSVC: Enable C++ conformance mode on compiler versions that support it.

MSVC has a conformance mode (/permissive-) where the C++ standard is more strictly
enforced. This mode is available on MSVC 15.5+ [1]

This patch enables this mode on compilers that support it and cleans up the few violations it threw up in the process.

- Mantaflow was using M_PI without requesting them using the _USE_MATH_DEFINES define to opt in to non default behaviour.
- Collada did not include the right header for std::cerr, this seemingly was fixed for other platforms already but put inside a platform guard.
- Ghost had some scoping issues regarding uninitialized variables and goto behaviour

Second landing of this patch, earlier commit was reverted due to some compiler configurations having slipped though testing

[1] https://docs.microsoft.com/en-us/cpp/build/reference/permissive-standards-conformance

Differential Revision: https://developer.blender.org/D6824

Reviewed By: brecht

Revert "Cleanup/MSVC: Enable C++ conformance mode on compiler versions that support it."

It is breaking compilation on some configurations, revert for now while
i see what is wrong.

This reverts commit 9fe469c110940af5d2525158305d5d365bd15276.

Cleanup/MSVC: Enable C++ conformance mode on compiler versions that support it.

MSVC has a conformance mode (/permissive-) where the C++ standard is more strictly
enforced. This mode is available on MSVC 15.5+ [1]

This patch enables this mode on compilers that support it and cleans up the few violations it threw up in the process.

- Mantaflow was using M_PI without requesting them using the _USE_MATH_DEFINES define to opt in to non default behaviour.
- Collada did not include the right header for std::cerr, this seemingly was fixed for other platforms already but put inside a platform guard.
- Ghost had some scoping issues regarding uninitialized variables and goto behaviour

[1] https://docs.microsoft.com/en-us/cpp/build/reference/permissive-standards-conformance

Differential Revision: https://developer.blender.org/D6824

Reviewed By: brecht

Cleanup: Fix build warnings from OSL shader compilation

There were to copies of stdosl.h one from stock OSL
and one in the cycles tree augmented with cycles
specific closures.

moved the cycles ones to stdcycles.h and copied
the stock stdosl.h and accompanying headers from
the OSL shader folder.

for further details see D6812.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D6812

Fix: Build error on windows

USD "library" directory was not set, leading to an error
during the INSTALL phase.

CTest: Disable the cross test from the avxf unit tests.

Test fails on AVX2, I'll look into this but until the
cause is determined the test will be disabled