[ov-java.cc] Introduce a fallback mechanism in case the JVM lib changed

[CdeMills]

Hello,

There is an long ongoing annoyance in ov-java: the path of libjvm is
statically determined at build time. This means that every version upgrade
requires to rebuild Octave. I experienced it a few days ago on Fedora 21. I
produced a patch introducing a fallback mechanism: if the original file
can't be found, it is searched from the environment variable "JAVA_JVM_LIB".

The patch was introduced against bug 40111 which is a bit old. Could the
maintainers of the java stack have a look at it ?

Regards

Pascal Dupuis



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