Summary
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Remove support for the non-standard "sun.security.policy.utf8" system property.

Problem
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This property was introduced in JDK 1.4.2 to preserve compatibility with policy files that were not encoded in UTF-8. See https://www.oracle.com/technetwork/java/javase/compatibility-142878.html for more details. 

Since JDK 1.4.0, all policy files are required to be encoded in UTF-8. This compatibility feature is not necessary anymore. It should be very low risk to remove support for this property.

Solution
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Remove support for the property. Require that all policy files are encoded in UTF-8.

Specification
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TBD.