[patch,gomp4] remove gwv test case

[Cesar Philippidis]

This patch removes the libgomp.oacc-c/gwv.c. test case. The original
idea behind this test was to allow us to create our own parallel loops
using by using the gang, worker and vector threads directly by using the
built-in GOACC_ thread functions. This test was supposed to ensure that
those functions work.

Now that we're working on a proper execution model, exposing those
functions to the end user doesn't make much sense. That's at least true
for workers and vectors because they start off in worker-single and
vector-single mode, respectively. Then there's the other issue of
variable broadcasting. As a result, this test case isn't necessary going
forward. Those thread functions are already being exercised by omp-low
for each acc loop anyway.

Cesar
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