fix spurious gnulib test-faccessat failure

[Jim Meyering]

FYI, I've just pushed the following to gnulib.
I noticed this new parallel test failure when coreutils started
using the very latest from gnulib.

    test-faccessat.c: correct BASE definition to avoid parallel test failure
    * tests/test-faccessat.c (BASE): Define using this file's name, not
    that of test-lstat.c.  Using the latter caused this test to fail
    sometimes when run concurrently with test-lstat.

diff --git a/tests/test-faccessat.c b/tests/test-faccessat.c
index 53855ba91..fe1db4129 100644
--- a/tests/test-faccessat.c
+++ b/tests/test-faccessat.c
@@ -26,7 +26,7 @@ SIGNATURE_CHECK (faccessat, int, (int, const char *, int, 
int));

 #include "macros.h"

-#define BASE "test-lstat.t"
+#define BASE "test-faccessat.t"

 int
 main (void)