Update build.ps1 for installer changes for VCRuntime dlls

[tristanlabelle]

Build script counterpart to swiftlang/swift-installer-scripts#256

[compnerd]

Please test with following PRs:
swiftlang/swift-installer-scripts#256

@swift-ci please build toolchain Windows platform

[tristanlabelle]

This failed because the list of redist files varies per toolchain version. The fix will be to harvest the directory. Working on this

Build FAILED.

       "C:\Users\swift-ci\jenkins\workspace\swift-PR-build-toolchain-windows\swift-installer-scripts\platforms\Windows\bundle\installer.wixproj" (default target) (1:7) ->
       "C:\Users\swift-ci\jenkins\workspace\swift-PR-build-toolchain-windows\swift-installer-scripts\platforms\Windows\rtl\msi\rtlmsi.wixproj" (default target) (4:5) ->
       (CoreCompile target) -> 
         C:\Users\swift-ci\jenkins\workspace\swift-PR-build-toolchain-windows\swift-installer-scripts\platforms\Windows\rtl\msi\rtlmsi.wxs(49): error WIX0103: Cannot find the File file 'C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Redist\\MSVC\\14.34.31931\\x64\\Microsoft.VC143.CRT\\vcruntime140_threads.dll'. The following paths were checked: C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Redist\\MSVC\\14.34.31931\\x64\\Microsoft.VC143.CRT\\vcruntime140_threads.dll [C:\Users\swift-ci\jenkins\workspace\swift-PR-build-toolchain-windows\swift-installer-scripts\platforms\Windows\rtl\msi\rtlmsi.wixproj]

[compnerd]

Please test with following PRs:
swiftlang/swift-installer-scripts#256

@swift-ci please build toolchain Windows platform

[compnerd]

Please test with following PRs:
swiftlang/swift-installer-scripts#256

@swift-ci please build toolchain Windows platform

[compnerd]

@swift-ci please test