hg: panama/dev: 8237883: clang builtin headers dir should be automatically added to include path of jextract

[sundararajan.athijegannathan at oracle.com]

Changeset: ba77136248bc
Author:    sundar
Date:      2020-01-27 19:38 +0530
URL:       https://hg.openjdk.java.net/panama/dev/rev/ba77136248bc

8237883: clang builtin headers dir should be automatically added to include path of jextract
Reviewed-by: mcimadamore

! src/jdk.incubator.jextract/share/classes/jdk/incubator/jextract/tool/Main.java
! test/jdk/tools/jextract/hello.h