Need reviewer - Change to jdk/test/makefile for shared library execute permissions

[Kelly O'Hair]

Need reviewer - Change to jdk/test/makefile for shared library execute  
permissions

We been having some spurious test failures on windows and finally  
tracked it down to this
issue. Fixing it in the jdk/test/Makefile seemed like the best place,  
even though none of us
really want shared libraries in the repositories, this seems to be the  
best fix.

This allows more tests to reliably run, although the shared libraries  
do need to exist
for the test to pass, so anyone removing these binary files should of  
course not run
the associated tests.

6943915: Adjust jdk/test/Makefile to deal with .dll and .so libraries  
needing execute permissions
http://cr.openjdk.java.net/~ohair/openjdk7/testMakefile-6943915/webrev/

I'll be testing this on all platforms tonight.

-kto