appveyor: minor improvements [ci skip]

- make per-job cmake options override default ones (as in GHA)
- also upload `.lib` artifacts (in commented code)

Cherry-picked from #20750

appveyor.yml

@@ -142,3 +142,5 @@ skip_commits:
 #    name: curl
 #  - path: '**/*.dll'
 #    name: libcurl dll
+#  - path: '**/*.lib'
+#    name: libcurl lib