mmdevapi/tests: Mark some failing tests as flaky.

dlls/mmdevapi/tests/render.c

@@ -1037,6 +1037,7 @@ static void test_clock(int share)
         ok(gbsize == bufsize,
            "BufferSize %u at rate %lu\n", gbsize, pwfx->nSamplesPerSec);
     else
+        flaky
         ok(gbsize == parts * fragment || gbsize == MulDiv(bufsize, 1, 1024) * 1024,
            "BufferSize %u misfits fragment size %u at rate %lu\n", gbsize, fragment, pwfx->nSamplesPerSec);
 
@@ -1111,6 +1112,7 @@ static void test_clock(int share)
     ok(hr == S_OK, "GetPosition failed: %08lx\n", hr);
     ok(pos > 0, "Position %u vs. last %u\n", (UINT)pos,0);
     /* in rare cases is slept*1.1 not enough with dmix */
+    flaky
     ok(pos*1000/freq <= slept*1.4, "Position %u too far after playing %ums\n", (UINT)pos, slept);
     last = pos;
 
@@ -2211,6 +2213,7 @@ static void test_worst_case(void)
 
         for(i = 0; i <= 99; i++){ /* 100 x 10ms = 1 second */
             r = WaitForSingleObject(event, 60 + defp / 10000);
+            flaky_wine
             ok(r == WAIT_OBJECT_0, "Wait iteration %d gave %lx\n", i, r);
 
             /* the app has nearly one period time to feed data */