clang/test/Driver/ps4-linker-non-win.c: Tweak for cygwin like ps4-linker-win.c@250403. Cygwin seeks dependent libs along $PATH.
clang/test/Driver/ps4-linker-non-win.c: Tweak for cygwin like ps4-linker-win.c@250403. Cygwin seeks dependent libs along $PATH.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@250632 91177308-0d34-0410-b5e6-96231b3b80d8

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