build.ps1: add a workaround for Android build break

The C++ driver will not add in the architecture to the library search
path when building for Android on Windows. Workaround this by
explicitly adding in the addition library search path. Once the early
swift-driver is enabled, this should be possible to remove.

Author: compnerd

utils/build.ps1

@@ -1678,6 +1678,11 @@ function Build-CMakeProject {
             "-Xclang-linker", "-resource-dir", "-Xclang-linker", "${AndroidPrebuiltRoot}\lib\clang\$($(Get-AndroidNDK).ClangVersion)"
           )
 
+          # FIXME(compnerd) remove this once we have the early swift-driver
+          if ($SwiftSDK) {
+            $SwiftFlags += @("-Xclang-linker", "-L", "-Xclang-linker", [IO.Path]::Combine($SwiftSDK, "usr", "lib", "swift", "android", $Platform.Architecture.LLVMName))
+          }
+
           $SwiftFlags += if ($DebugInfo) { @("-g") } else { @("-gnone") }
 
           Add-FlagsDefine $Defines CMAKE_Swift_FLAGS $SwiftFlags