tests: Avoid InterlockedExchangeAdd() as it is not supported on Windows 95.

[Francois Gouget]

---
 include/wine/test.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/include/wine/test.h b/include/wine/test.h
index 32850ce..72cd84c 100644
--- a/include/wine/test.h
+++ b/include/wine/test.h
@@ -354,7 +354,8 @@ void winetest_wait_child_process( HANDLE process )
     {
         fprintf( stdout, "%s: %u failures in child process\n",
                  current_test->name, exit_code );
-        InterlockedExchangeAdd( &failures, exit_code );
+        while (exit_code-- > 0)
+            InterlockedIncrement(&failures);
     }
 }
 
-- 
1.5.3.8