hg: panama/dev: 8225533: jextract failed with native function declaration with java keyword

[henry.jen at oracle.com]

Changeset: c48499073dff
Author:    henryjen
Date:      2019-06-11 09:47 -0700
URL:       http://hg.openjdk.java.net/panama/dev/rev/c48499073dff

8225533: jextract failed with native function declaration with java keyword
Reviewed-by: sundar

! src/jdk.jextract/share/classes/com/sun/tools/jextract/JavaSourceBuilder.java
+ test/jdk/com/sun/tools/jextract/Test8225533.java
+ test/jdk/com/sun/tools/jextract/exports.h