hg: panama/dev: 8194955: When no -o option mentioned jextract parses headers and exits, help option should be --help

[sundararajan.athijegannathan at oracle.com]

Changeset: 65ff6482c4d5
Author:    sundar
Date:      2018-01-15 20:59 +0530
URL:       http://hg.openjdk.java.net/panama/dev/rev/65ff6482c4d5

8194955: When no -o option mentioned jextract parses headers and exits, help option should be --help
Reviewed-by: mcimadamore

! src/jdk.jextract/share/classes/com/sun/tools/jextract/Main.java
! src/jdk.jextract/share/classes/com/sun/tools/jextract/resources/Messages.properties