Fix sub_test failure for test/link/sungeun/static_dynamic.

This test broke because the .skipif file had execute permissions.
The new behavior of sub_test is to try to run a .skipif file as a script if it is
executable (and otherwise pipe it through util/test/testEnv).

The cure is to remove execute permissions from this file.
Merge branch 'master' of github.com:hildeth/chapel