Manual test of the keysstore feature
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mscng backend:

- import tests/keys/rsakey-win.p12 (double-click on it)
- verify that the import happened, using certmgr.msc
- sign: win32/binaries/xmlsec.exe sign --crypto mscng --output out.xml tests/keysstore/keysstore.xml
- verify: win32/binaries/xmlsec.exe verify --crypto mscng out.xml
