build.ps1: attempt to repair the ARM64 cross-compile

Author: compnerd

utils/build.ps1

@@ -2845,6 +2845,8 @@ function Build-Foundation {
     -SwiftSDK $SwiftSDK `
     -Defines @{
       BUILD_SHARED_LIBS = if ($Static) { "NO" } else { "YES" };
+      # FIXME(compnerd) - workaround ARM64 build failure when cross-compiling.
+      CMAKE_NINJA_FORCE_RESPONSE_FILE = "YES";
       CMAKE_STATIC_LIBRARY_PREFIX_Swift = "lib";
       CMAKE_Swift_FLAGS = $SwiftFlags;
       FOUNDATION_BUILD_TOOLS = if ($Platform.OS -eq [OS]::Windows) { "YES" } else { "NO" };