Support arm64 on windows.

[aalekhm]

Added macro to build for arm64EC configuration on windows.

[aalekhm]

Hi @tmatth, saw that you are actively contributing to master.
Is there anyone who can review & merge this commit?

[tmatth]

Hi @aalekhm I don't have hardware to test this, we could see about adding it to our CI configuration. Can you share build logs just so we have some evidence of it working?

[aalekhm]

@tmatth Attached are the build logs for arm64 & arm64EC on VS2022(Version 17.14.27)

Library built on device with following specifications:
Device Specifications:

• Processor : Snapdragon(R) X Elite - X1E78100 - Qualcomm(R) Oryon(TM) CPU (3.42 GHz)

• Installed RAM : 32.0 GB (31.6 GB usable)

• System type : 64-bit operating system, ARM-based processor

Windows Specifications:

• Edition : Windows 11 Enterprise

• Version : 24H2

• OS build : 26100.7623

vorbis_buildlog_arm64EC.txt
vorbis_buildlog_arm64.txt

[aalekhm]

@tmatth Is the data provided above sufficient?

[tmatth]

@aalekhm will merge here.

Thanks for the contribution. For future work, please do so at the official upstream:
https://gitlab.xiph.org/xiph/vorbis (we will need to manually grant you permission to fork repos). This github repo is simply a mirror.