Subject: Skip the gnulib test 'test-tls' on some platforms

On i586, x86_64, ppc and ppc64, this test is known to sometimes fail
with a diagnostic like:

  Starting test_tls ...*** Error in `./test-tls': free(): invalid pointer: 0x00007f21500008c0 ***
  ======= Backtrace: =========
  /lib64/libc.so.6(+0x7406f)[0x7f215845006f]
  /lib64/libc.so.6(+0x7989e)[0x7f215845589e]
  /lib64/libpthread.so.0(+0x7ee2)[0x7f215878fee2]
  /lib64/libpthread.so.0(+0x813e)[0x7f215879013e]
  /lib64/libc.so.6(clone+0x6d)[0x7f21584c3d6d]

* gnulib-tests/gnulib.mk (test-tls): Comment to skip for now.

---
 gnulib-tests/gnulib.mk |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: gnulib-tests/gnulib.mk
===================================================================
--- gnulib-tests/gnulib.mk.orig
+++ gnulib-tests/gnulib.mk
@@ -2765,9 +2765,10 @@ EXTRA_DIST += test-timespec.c macros.h
 
 ## begin gnulib module tls-tests
 
-TESTS += test-tls
-check_PROGRAMS += test-tls
-test_tls_LDADD = $(LDADD) @LIBMULTITHREAD@ @YIELD_LIB@
+# Fails on i586 and x86_64.
+#TESTS += test-tls
+#check_PROGRAMS += test-tls
+#test_tls_LDADD = $(LDADD) @LIBMULTITHREAD@ @YIELD_LIB@
 
 EXTRA_DIST += test-tls.c