Remove all JNI header, as they were unified in GlueGen commit 532b8df474976b474f0cf4eb2d93588ded2ad3fe
Adapt to new JNI header location within GlueGen, completes commit 9fb45e70730198fa7be940c5b48dd5c59bf04b93JNI header moved to GlueGen via commit 532b8df474976b474f0cf4eb2d93588ded2ad3fe
Bug 1149 - Replacing PCPP w/ JCPP: Update HowToBuild.html