* JAVA_INT etc are used instead of generated bindings in Constants$root.java
* updateclang extract.sh still uses -d instead of the new --output option
* copyright year is 2021 for jextract generated sources (cp_header.txt goes into generated clang headers)
* updateclang extract.sh still uses -d instead of the new --output option
* copyright year is 2021 for jextract generated sources (cp_header.txt goes into generated clang headers)