mainly build system fixes

[K-os]

• cleanup cmake toolchain files
• add ubuntu armv7 toolchain file (gh: Failed to compile Linux armv7 vvdec binary for errors of new release vvdec 2.3.0 #175)
• fix build with TARGET_SIMD_X86 disabled (gh: Failed to compile Linux armv7 vvdec binary for errors of new release vvdec 2.3.0 #175)
• impove target architecture detection heuristics
• don't build avx2 files, when not needed
• fix windows for arm64 builds (untested)

[shijunz]

• fix windows for arm64 builds (untested)
  I am trying to build the windows-arm64 version now. I want to know how to configure the cmake cmd for the windows arm64? could you help me? I do not think it is easy way to do ,

I think the most of work should be about the simde modules? or someone use the simde module for windows arm64 before?

thanks in advances.

[K-os]

It does compile with SIMD-Everywhere enabled (the default) for ARM64 using Visual Studio, but since we don't have an ARM based windows machine, it's untested.

Feel free to give it a try and report your findings.

[shijunz]

It does compile with SIMD-Everywhere enabled (the default) for ARM64 using Visual Studio, but since we don't have an ARM based windows machine, it's untested.

Feel free to give it a try and report your findings.

yes, I have two ARM based windows machine, could you share me the detail? how to build windows arm64? I am happy to test it.

[K-os]

Using the top-level Makefile add the parameter msvc-arch=arm64 to your make call, or if you are using CMake directly add the parameter -A arm64 to your cmake commandline.

A good first test would be to run the test-suite for example:

make msvc-arch=arm64  enable-bitstream-download=1 release
make test

or like this:

cmake -A arm64 -B build/win_arm64 -DVVDEC_ENABLE_BITSTREAM_DOWNLOAD=ON
cmake --build build/win_arm64
cmake --build build/win_arm64 -t test