Make ufo grok perl6-j (Rakudo on the JVM)

[masak]

<moritz> TODO: teach ufo about perl6-j
<masak> mind if I file a github issue about that?
<moritz> masak: it's your project; the correct question is if *you* mind :-)
<masak> moritz: what needs to be done for the issue to be closed?
<moritz> masak: 'ufo && make test' should succeed even when the default 'perl6' is a perl6-j

[moritz]

Possible approach:

• always use perl6-p executable (I wouldn't recommend that)
• Detect at ufo run time if stuff should be compiled to .pir or .jar
• Generate a much more clever Makefile (no idea how it would look like)

[arnsholt]

I guess the simplest way would be detecting whether we want PIR or JAR at runtime?

Detecting the backend is a simple matter of peeking in $*VM, so that's easy. Does the JVM module loader look for JAR files in the same way the Parrot one looks for PIR files though?