RFR: 8056213 : Clean up unix/native/common/sun/awt

[Phil Race]

After looking at the issues in the bug report below I think the only
think that must be fixed is the unnecessary inclusion of initIDS.c in 
libawt_xawt.so

https://bugs.openjdk.java.net/browse/JDK-8056213
http://cr.openjdk.java.net/~prr/8056213/

I've tested this out on Linux and am submitting a full JPRT job.

-phil.