#386: fix compilation of java when using gnumake

[fbergmann]

Description

javabindings where not compiling when using the configure based process.

Motivation and Context

• fixes an issue with swigdoc expression that is invalid
• changes detection of openjdk on Darwin (since the JDK is no longer supplied by apple)

fixes #386

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Change in documentation

Checklist:

• [ ] I have updated all documentation necessary.
• [ ] I have checked spelling in (new) comments.

Testing

• [ ] Testing is done automatically and codecov shows test coverage
• [x] This cannot be tested automatically

can be tested using ./configure --with-java && make