jextract to write classifies if a directory is specified with -o

[Henry Jen]

Hi,

jextract use -o options to specify output file, typically a jar file is created.

Developer may want to have class files rather than get an jar file and extract it for some reason, like to package with other libraries or more “civilized” API on top of native API.

This webrev[1] enable to write class files if a directory is specified as destination instead of getting an error.

[1] http://cr.openjdk.java.net/~henryjen/panama/buildClasses/webrev/

Cheers,
Henry