Explicitly specify name of the pipe in the pipe test.

dlls/kernel/tests/pipe.c

diff --git a/dlls/kernel/tests/pipe.c b/dlls/kernel/tests/pipe.c
index d892f86..eb75ec4 100644
--- a/dlls/kernel/tests/pipe.c
+++ b/dlls/kernel/tests/pipe.c
@@ -48,7 +48,7 @@
 #include <wtypes.h>
 #include <winerror.h>
 
-#define PIPENAME "\\\\.\\PiPe\\tests_" __FILE__
+#define PIPENAME "\\\\.\\PiPe\\tests_pipe.c"
 
 #define NB_SERVER_LOOPS 8