[nicl] RFR: implementation for -l option of jextract tool

[Sundararajan Athijegannathan]

Implementation for -l <library> option of jextract tool:

The backend already supports @LibraryDependencies annotation to 
automatically load shared libraries. Current fix is to generate 
@LibrarayDependencies from jextract if user specifies one or more -l 
options. A test added to verify that the backend supports 
@LibrarayDependencies annotation.

Webrev: http://cr.openjdk.java.net/~sundar/jextract_l_option/webrev.00/

Thanks,
-Sundar