Thanks a lot! I am still trying to get a successful 2.83 build on windows but now I am running into some SVN errors when doing subsequent make update after checking out 2.83 release branch. What’s curious is that the issues persisted even after I completely deleted and re-downloaded the lib folder.
So now I am in the process of trying the whole process from start to finish in completely different folder, as I may have corrupted something.
I am 99% sure this is error on my side though.
EDIT:
svn: E155009: Failed to run the WC DB work queue associated with ‘D:\LIB_Projects\Blender_Source\lib\win64_vc15\xr_openxr_sdk\lib’, work item 22052 (file-install python/37/DLLs/_lzma.pyd 1 0 1 1)
svn: E720005: Can’t move ‘D:\LIB_Projects\Blender_Source\lib\win64_vc15.svn\tmp\svn-2D6C8B1C’ to ‘D:\LIB_Projects\Blender_Source\lib\win64_vc15\python\37\DLLs_lzma.pyd’: Access is denied.
C:\Program Files\TortoiseSVN\bin\svn.exe --non-interactive update D:/LIB_Projects/Blender_Source/blender..\lib\win64_vc15
svn: E155037: Previous operation has not finished; run ‘cleanup’ if it was interrupted
When I do make update for master, instead of 2.83 release though, make update succeeds 
EDIT2: Finally managed a sucessful make update, but for some reason it took several SVN cleanup commands in succession to finally happen.