Add ASN1 module to SourceKit-LSP Test

Super surprised to see the build for swift test hardcoded in
the build.ps1 script instead of in the sourcekit-lsp repo.
At any rate, looks like I need to add the dependency on ASN1
here too.

This is to support changes in SwiftPM that add the dependency
which translates through to sourcekit-lsp.

swiftlang/swift-package-manager#8610

Author: dschaefer2

utils/build.ps1

@@ -2986,6 +2986,9 @@ function Test-SourceKitLSP {
     "-Xswiftc", "-I$(Get-ProjectBinaryCache $BuildPlatform Crypto)\swift",
     "-Xlinker", "-L$(Get-ProjectBinaryCache $BuildPlatform Crypto)\lib",
     "-Xlinker", "$(Get-ProjectBinaryCache $BuildPlatform Crypto)\lib\CCryptoBoringSSL.lib",
+    # swift-asn1
+    "-Xswiftc", "-I$(Get-ProjectBinaryCache $BuildPlatform ASN1)\swift",
+    "-Xlinker", "-L$(Get-ProjectBinaryCache $BuildPlatform ASN1)\lib",
     # swift-package-manager
     "-Xswiftc", "-I$(Get-ProjectBinaryCache $BuildPlatform PackageManager)\swift",
     "-Xlinker", "-L$(Get-ProjectBinaryCache $BuildPlatform PackageManager)\lib",