build: Add more searching for Java libjvm.so. On Macs, look for jni.h in a list of possible directories. * configure.ac: Search for libjvm in JAVA_LDPATH, JAVA_BOOTPATH, and heuristic list of directories. Search for jni.h in possible list of directories on Mac platforms. * build-aux/OctJavaQry.java: Add JAVA_BOOTPATH query option. * build-aux/OctJavaQry.class: Add JAVA_BOOTPATH query option.

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