godot: Build Fail on Windows 10

Godot version: 3.2 RC 2

OS/device including version: Windows 10

Issue description: Build failing on Windows Developer Powershell for VS2019 and normal powershell, with vsproj=yes. without vsproj=yes build works but uses mingw instead of msvc

Steps to reproduce: scons -j12 platform=windows vsproj=yes

Configuring for Windows: target=debug, bits=default
Using MinGW
UnsupportedVersion: Unknown version None:
  File "D:\godot\SConstruct", line 529:
    methods.generate_vs_project(env, GetOption("num_jobs"))
  File "D:\godot\methods.py", line 528:
    batch_file = find_visual_c_batch_file(env)
  File "D:\godot\methods.py", line 514:
    return find_batch_file(env, version, host_platform, target_platform)[0]
  File "C:\Users\senpai\scoop\apps\scons\3.1.2\scons-local-3.1.2\SCons\Tool\MSCommon\vc.py", line 407:
    pdir = find_vc_pdir(msvc_version)
  File "C:\Users\senpai\scoop\apps\scons\3.1.2\scons-local-3.1.2\SCons\Tool\MSCommon\vc.py", line 368:
    raise UnsupportedVersion("Unknown version %s" % msvc_version)

Minimal reproduction project: Vanilla