message: Fixes vs2010 doesn't recognize host=x64 also host=amd64
  2010 doesn't have x64 host compiler.
diff: @@ -774,6 +774,7 @@ async function tryCreateNewVCEnvironment(inst: VSInstallation, hostArch: string,
  log.debug(` DisplayName: ${name}`);
  log.debug(` InstanceId: ${inst.instanceId}`);
  log.debug(` InstallVersion: ${inst.installationVersion}`);
  + const majorVersion = parseInt(inst.installationVersion);
  if (version) {
  const generatorName: string|undefined = VsGenerators[version[1]];
  if (generatorName) {
  @@ -782,7 +783,7 @@ async function tryCreateNewVCEnvironment(inst: VSInstallation, hostArch: string,
  name: generatorName,
  platform: generatorPlatformFromVSArch[targetArch] as string || targetArch,
  // CMake generator toolsets support also different versions (via -T version=).
  - toolset: "host=" + hostArch
  + toolset: majorVersion < 15 ? undefined : "host=" + hostArch
  };
  }
  log.debug(` ${localize('selected.preferred.generator.name', 'Selected Preferred Generator Name: {0} {1}', generatorName, JSON.stringify(kit.preferredGenerator))}`);
  