AndreMiras / pyjnius / 39856309095

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:bug: Allow automatic JRE fallback without javac

Return None for ordinary helper misses so discovery can try a JRE
when no JDK is found. Fix JAVA_HOME lookup in the JRE helper and
allow default-directory fallback. Support Java 8 runtime libraries
at lib/{cpu}/server/libjvm.so.

Preserve JAVA_HOME > JDK_HOME > JRE_HOME precedence and unexpected
probe errors. Windows requires a configured home; exhaustion now
raises RuntimeError with JAVA_HOME guidance. Retain nested
JAVA_HOME/jre selection for direct helper callers.

Source builds that discover only a JRE now reach the existing
"You need a JDK, we only found a JRE" guard. Add portable regressions
and document platform-specific discovery.

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