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utils: update the build-windows-toolchain.bat to extract the toolchain

Fetch a prebuilt toolchain to build the toolchain.  This is required to
enable the macro support on Windows.

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# build: build SwiftSyntax before the toolchain build
#
# Perform a build of Swift Syntax prior to the build of the toolchain so
# that we can enable the early swift syntax parser builds.  This is a
# prerequisite for enabling macros on Windows.

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# build: wire up the early swift-syntax build to the build
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# This enables the early swift syntax build to get us macro support on
# Windows.
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# # Update build-windows-toolchain.bat
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# # Update build-windows-toolchain.bat
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# # Update build-windows-toolchain.bat
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# # Update build-windows-toolchain.bat

Author: compnerd