RFR: JDK-8134290

[Ingemar Aberg]

Please review my fix for this P2 bug

The executables built by the ant-based tonga build system don't get 
their executable bits set, this causes them to fail
with 'permission denied'. Fix by running 'chmod +x' on those files after 
building.

As a bonus a remedy for JDK-8077107 
<https://bugs.openjdk.java.net/browse/JDK-8077107> is also included, 
removing lots of unneeded .o and .a files from the test image.

Bug: https://bugs.openjdk.java.net/browse/JDK-8134290
WebRev: 
http://10.161.190.150/~ingo/webrev/JDK-8134290-Fix-tonga-permissions/