Make skia_use_xps option work on Windows

Some may not want to always compile XPS on Windows

Change-Id: Icd4cc993667fdce740216b9c52a0a649dcf79645
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278782
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
3 files changed