Update build-windows-toolchain.bat

Author: compnerd

utils/build-windows-toolchain.bat

@@ -973,7 +973,7 @@ msbuild %SourceRoot%\swift-installer-scripts\platforms\Windows\bundle\installer.
   -p:BaseReleaseDownloadUrl=https://download.swift.org/development/windows ^
   -p:Configuration=Release ^
   -p:BaseOutputPath=%PackageRoot%\online\ ^
-  -p:VCRedistInstaller=%VCToolsRedistDir%\vc_redist.%VSCMD_ARG_TGT_ARCH%.exe ^
+  -p:VCRedistInstaller="%VCToolsRedistDir%\vc_redist.%VSCMD_ARG_TGT_ARCH%.exe" ^
   -p:VSVersion=%VSCMD_VER% ^
   -p:DEVTOOLS_ROOT=%BuildRoot%\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain ^
   -p:TOOLCHAIN_ROOT=%BuildRoot%\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain ^
@@ -989,7 +989,7 @@ msbuild %SourceRoot%\swift-installer-scripts\platforms\Windows\bundle\installer.
   -p:BundleFlavor=offline ^
   -p:Configuration=Release ^
   -p:BaseOutputPath=%PackageRoot%\offline\ ^
-  -p:VCRedistInstaller=%VCToolsRedistDir%\vc_redist.%VSCMD_ARG_TGT_ARCH%.exe ^
+  -p:VCRedistInstaller="%VCToolsRedistDir%\vc_redist.%VSCMD_ARG_TGT_ARCH%.exe" ^
   -p:VSVersion=%VSCMD_VER% ^
   -p:DEVTOOLS_ROOT=%BuildRoot%\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain ^
   -p:TOOLCHAIN_ROOT=%BuildRoot%\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain ^