Use correct native lib prefix in native AOT for android

[sbomer]

#118299 introduced _UseNativeLibPrefix as an underscored property. Looks like android may need to set this: dotnet/android#10822.

At the time we didn't want to change the default to avoid breaking existing scenarios, but I wonder - could we try using the lib prefix by default on unix and take this breaking change? AFAIK this is a very common convention on unix so it would probably be a good default.

We could also introduce a public property to allow opting out for scenarios that don't want this.

@jtschuster @MichalStrehovsky

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[MichalStrehovsky]

We can try. When the underscored property got added, I simply wanted it to be non-underscored so that people can set it. But we can also set the breaking default for it.