tdf#106854 svl windows: enable CNG by default

But keep the environment variable to disable it for testing purposes.
This means that signing with ECDSA keys works out of the box on Windows.

Change-Id: I2820deb45377c54b59cdbd27a490af9beaf62851
Reviewed-on: https://gerrit.libreoffice.org/56901
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
diff --git a/svl/source/crypto/cryptosign.cxx b/svl/source/crypto/cryptosign.cxx
index c7e62d5..f256613 100644
--- a/svl/source/crypto/cryptosign.cxx
+++ b/svl/source/crypto/cryptosign.cxx
@@ -2422,8 +2422,8 @@ bool Signing::Verify(SvStream& rStream,

bool isMSCng()
{
    static bool bMSCng = getenv("SVL_CRYPTO_CNG");
    return bMSCng;
    static bool bNoMSCng = getenv("SVL_CRYPTO_NOCNG");
    return !bNoMSCng;
}

}