[foreign] RFR compiler built-in header files

[Sundararajan Athijegannathan]

Hi,

Few compiler built-in header files like stdarg.h are not found in the 
usual places like /usr/include. We need to bundle these header files so 
that jextract can locate & use these.

Please review: 
http://cr.openjdk.java.net/~sundar/builtin_header_files/webrev.01/

Thanks,
-Sundar